My Candle Is Darker on the Side Exposed to Light — Is This More Likely Related to UV Exposure Than Normal Fragrance Discoloration?
शेयर करना
Opaque 70g votive jars ₹31.86 each — same price as clear No UV inhibitor or colour stabiliser is listed in the CSI catalogue Stocked in India · ships nationwide
CSI stability guides · light exposure
Fragrance tones a candle evenly, all the way round. A candle that is darker on one face is telling you about the shelf, not the bottle.
★★★★★
"Good product"
Biny AbrahamVerified buyer · Feb 2026
Black Glass Jar with Black Lid
★★★★★
"Fresh and soothing"
Yashvi ShahVerified buyer · Jul 2025
Blue Ocean Fragrance Oil
★★★★★
"…The wax quality especially has been top notch.…"
SraddhaVerified buyer · Mar 2025
Gardenia Fragrance Oil
★★★★★
"all the materials are high quality and ultimate fragrance range"
Arminder KaurVerified buyer · Mar 2026
Premium Coconut Soy Wax CSI 468
★★★★☆
"Fragrance is awesome. Hot throw is also very good after burn candle."
AkanshaVerified buyer · Dec 2025
Lavender Fragrance Oil
★★★★★
"I have purchased this fragrance and it is amazing..their quality is extremely good…"
Lalitha JaganAug 2024
Apple Cinnamon Fragrance Oil
★★★★★
"Good product"
Biny AbrahamVerified buyer · Feb 2026
Black Glass Jar with Black Lid
★★★★★
"Fresh and soothing"
Yashvi ShahVerified buyer · Jul 2025
Blue Ocean Fragrance Oil
★★★★★
"…The wax quality especially has been top notch.…"
SraddhaVerified buyer · Mar 2025
Gardenia Fragrance Oil
★★★★★
"all the materials are high quality and ultimate fragrance range"
Arminder KaurVerified buyer · Mar 2026
Premium Coconut Soy Wax CSI 468
★★★★☆
"Fragrance is awesome. Hot throw is also very good after burn candle."
AkanshaVerified buyer · Dec 2025
Lavender Fragrance Oil
★★★★★
"I have purchased this fragrance and it is amazing..their quality is extremely good…"
Lalitha JaganAug 2024
Apple Cinnamon Fragrance Oil
Reviews collected and published through Judge.me on candlemakingsuppliesindia.store. One longer review is shortened with an ellipsis; wording is otherwise unedited.
✓ Stated jar capacities and dimensions published per listing ✓ 78 containers listed ✓ Bulk pricing, GST invoicing & documentation on WhatsApp
Candle Business Guides · Discolouration
The unevenness is the evidence. Fragrance materials tone wax throughout its body; a difference between two faces of the same jar correlates with where the jar sat. Three controls separate the two, and one of them is free.
3 controls
a masked face, a twin in a closed dark carton, and an unscented blank in the same light · 14 units withheld, ₹3,285.33 on a 150g candle · the opaque 70g votive swap costs ₹0, at ₹31.86 either way · CSI live pricing, September 2026
Quick answers — read this first
Is it light or the fragrance? If one face is darker than the other on the same jar, or there is a gradient down the glass, or back-of-rack units look fresher, that pattern points at exposure. Fragrance-driven toning shows up evenly, all round, through the whole wax body — because the materials are dissolved in it.Is it specifically UV? Honestly, you cannot tell with a mask. A card or foil mask blocks visible light and ultraviolet together, so it proves light exposure without identifying which part of the spectrum did the work. No CSI page addresses the question, and we are not going to name a mechanism we cannot demonstrate.
What do I run? Three controls. 4 units left where they were, 4 with one face masked, 4 in a closed dark carton, plus 2 freshly poured unscented blanks in the same light. That is 14 units and ₹3,285.33 of stock on a 150 g candle — 2.7% of a 500-unit batch.
What is the fix? Not an additive — CSI lists no UV inhibitor, UV absorber or colour stabiliser. It is the vessel, the packaging and the placement. For 70 gram votives the swap from clear to matte white is ₹31.86 either way — the same price and the same stated ~70g fill.
The short answer
Read the geometry first: two faces, three heights, six readings per jar. Unevenness that lines up with the room is an exposure finding. Unevenness that lines up with nothing is a mixing or pour finding.
A mask is the cheapest control in candle making: a strip of card taped over one face of a jar costs nothing and produces a line you can see. Whatever is outside the mask happened because of light.
Both causes can be running at once: a vanillin-bearing oil toning the whole candle plus a light gradient on one face is a perfectly ordinary combination. The unscented blank in the same light is what separates the two contributions.
In this guide
Arm 1 is not a control — it is the thing being measured. Arms 2, 3 and 4 are the three controls, and they answer three different questions: did light do it, did the shelf do it, and does the wax do it without any fragrance present. Running one of the three and calling it a test is the usual mistake.
Same price as clear · ~70g fill
White Matte Votive Jar · ₹31.86
Opaque 200 ml jar
Brown Matte Glass Jar · ₹70.80
Changing the vessel?
Ask on WhatsApp
Straight answer
My candle is darker on the side that faced the light — is that exposure rather than fragrance discolouration?
The asymmetry is the argument. Fragrance materials that tone wax are dissolved throughout it, so a fragrance-driven change appears evenly, all the way round, and through the depth of the candle. A difference between two faces of the same jar, a gradient running down the glass, or a rack where the front row has moved and the back row has not, all correlate with where the candle sat rather than with what is in it. So yes: one-sided darkening is far more likely an exposure finding. Whether the responsible part of the light is ultraviolet specifically is a different question, and a card mask cannot answer it — a mask blocks visible and ultraviolet light together. No CSI page addresses the spectrum, so treat "light exposure" as the honest conclusion and stop there. Prove it with three controls: leave four units where they were, tape a card over one face of four more, put four in a closed carton in the dark, and pour two unscented blanks to stand in the same light. Fourteen units, ₹3,285.33 of stock on a 150 g candle, 2.7% of a 500-unit batch. Read six points per jar — two faces at three heights — at days 0, 14, 30 and 60. And note what the fix is not: CSI lists no UV inhibitor, UV absorber or colour stabiliser, so the levers are the vessel, the carton and the shelf. For 70 gram votives, matte white glass costs exactly the same as clear: ₹31.86 either way, same stated ~70g fill.
One line: tape a card over one face of four jars, put four twins in a dark box, pour two unscented blanks — and let the straight edge under the card tell you what the shelf has been doing.
The zero-cost change first: White Matte Votive Jar 70 gram at ₹31.86 is the same price as the Clear Glass Votive Jar 70 gram at ₹31.86, and both state a ~70g wax fill. For bigger candles, Brown Matte, Black Matte and White Matte Glass Jars are ₹70.80 each.
Shop containers
The verdict on the stock in hand
One-sided darkening changes how you sample the batch, not whether you can sell it.
Colour change on the wax body is cosmetic, and the findings that stop a dispatch are the physical ones: cracked or chipped glass, a wick leaning on the glass, a wick that clogs or drowns on a test burn, a jar uncomfortably hot to hold at two hours. Light-driven darkening produces none of those. So the verdict on the batch is inspect then decide — with one important difference from an evenly toned batch.
If the cause is position, then your batch is not uniform, and a sample drawn from one place will mislead you. A tray taken from the back of the bottom shelf will look perfect and clear the whole batch; a tray from the sunny end will condemn stock that is fine. That is the argument for stratified sampling: draw deliberately from the positions that differ, not conveniently from the nearest carton.
Stratified inspection · a batch that is not uniform
Where to draw the sample from, and what each position is there to tell you
| Position | Units to draw | What this position answers |
|---|---|---|
| Front of the most exposed shelf, room-facing | 4 | The worst case. If these are acceptable, everything is |
| Back of the same shelf, wall-facing | 4 | The same shelf minus the exposure — an in-place control |
| Inside a closed carton on the same shelf | 4 | Whether the carton was already doing the job for you |
| Bottom shelf or interior of the stack | 4 | The best case, and your reference for "what it should look like" |
| Any unit that has never left its outer box | 2 | The closest thing you have to a day-zero reference after the fact |
The mistake: grading the whole batch off one tray. With a position-driven cause, batch-level language stops meaning anything — "the Diwali stock has yellowed" is false if two-thirds of it is in cartons on the middle shelf and fine. Grade by position instead: sort the affected units into an acceptable group and a seconds group, put the reference photographs beside them, and price and describe the two groups differently. Diwali 2026 is 8 November, and sorting eighteen trays is a day's work against the cost of holding or discounting a whole run.
Two signatures: even versus one-sided
Before any test, look carefully. The two causes leave genuinely different marks, and you can often tell them apart with a lamp and five minutes. Both can also be present together, which is why the table has a third column.
The differential · fragrance-driven toning against light-driven darkening
What each looks like, and what it looks like when both are happening
| Observation | Fragrance-driven | Light-driven | Both together |
|---|---|---|---|
| Distribution around the jar | Even on every face | Darker on the exposed face; often a visible boundary | An overall warm tone with one face warmer still |
| Distribution with depth | Through the whole body of the wax | Concentrated at the surface the light reached | Warm throughout, with a darker outer skin on one side |
| Consistency across the batch | All units similar, wherever they sat | Tracks shelf position: front worse than back, open worse than boxed | A floor of even toning, plus a position gradient on top of it |
| Behind a mask | Masked strip tones like the rest | Masked strip stays pale — a straight, unmistakable edge | Masked strip tones, but less than the exposed area |
| In a dark carton | Darkens the same as the shelf units | Stays close to day zero | Darkens, but less than the shelf units |
| An unscented blank in the same light | Stays put — nothing was added | Develops its own light-side gradient | Develops a gradient but no overall toning |
| What the oil's page says | Often names vanillin, amber, tonka, benzoin, resins or cocoa | Irrelevant — a 0%-vanillin oil can still sit in the sun | Page names a material and your rack faces a window |
The fourth row is the one to internalise. Nothing except light makes a straight edge. Wax does not know where a piece of card stops; fragrance materials are dissolved evenly; temperature reaches the whole jar. A crisp pale stripe where the mask was is about as close to a definitive result as this subject offers, and it costs a strip of card and some tape.
A 0% vanillin oil is not a light-proof candle
Makers who have done the fragrance work sometimes conclude that a light gradient must be impossible because the page says "Vanillin content 0% - no discolouration" — as Sandalwood and Blue Ocean both do. Those statements are about the oil's composition, not about what a jar does on a sunlit shelf. In fact a 0%-vanillin oil makes the diagnosis easier: with the fragrance candidate documented away, one-sided darkening has fewer places left to come from. Run the controls anyway, and log which oil each arm used.The three controls, step by step
1
Photograph and map the rack before you touch anythingStand where the light comes from and photograph the rack as it is. Then sketch it: which shelf, which row, which direction each face points, where the window and the lights are, and which cartons were open. Once you move a single tray this information is gone, and it is the thing that turns a colour observation into a position finding.
2
Draw 12 units from the batch and label them by arm and positionFour for EXPOSED, four for MASKED, four for DARK — and record where each one came from, because you are going to put the EXPOSED and MASKED units back in those exact places. Write arm, unit number, shelf, row and facing on the base of each jar with a marker.
3
Pour two unscented blanks in the same jar model, the same dayMelt 276 g of Luxury Soy Wax Chunks for two 150 g candles at 138 g each — no fragrance, same jar, same wick, add and pour inside the stated 80–90°C and 70–80°C windows. These go onto the exposed shelf beside the EXPOSED arm. They are the only way to find out whether the wax itself responds to your light without any fragrance in it.
4
Mask one face of each MASKED unit with a hard, opaque edgeCut card or kitchen foil into a strip about a third of the way round the jar and tape it so it sits flat against the glass with a clean vertical edge. Mark the mask's position on the base so you can put it back identically after each reading. Do not use translucent tape or paper across the whole jar — the value is entirely in the contrast between masked and unmasked on the same candle.
5
Put the DARK arm in a closed carton in the coolest dark place you haveLids on, carton taped shut, away from the window and away from anything warm. This is the arm that separates the shelf from the formula: if the dark twins darken as much as the exposed units, then a large part of what you are seeing is not about light and you should look at the fragrance and the temperature instead.
6
Read all 14 units at days 0, 14, 30 and 60, six points per jarFor each jar, note the shade at the exposed face and the opposite face, at top, middle and bottom — six readings. Photograph every jar with the white card in frame, one lamp, curtains shut, and shoot the MASKED units with the card removed and then replaced. Weigh each unit lid-on while you have it in your hand.
7
Burn one unit per arm at day 60 and write the conclusion as a sentenceTwo hours each: time to a full melt pool, flame height, soot, mushrooming, throw at 30 and 120 minutes. Then write it down plainly — "masked strip clearly paler than the exposed face at day 30; dark twins unchanged; blanks show a faint light-side gradient" is a conclusion. "I think it's the sun" is not, and it will not persuade a retail buyer.
Do not move the exposed units to somewhere more convenient. The commonest way this test fails is that the EXPOSED arm gets picked up, photographed on a different bench, and left there — at which point its exposure history stops matching the batch it represents and the whole comparison collapses. Photograph in a fixed spot, then return every unit to the exact shelf, row and facing you recorded in step 2. If you cannot commit to that, run only the MASKED arm: it carries its own control on the same candle and survives being handled.
UV or just light? What a mask can and cannot prove
The question in the title deserves a precise answer rather than a confident one. A card or foil mask is opaque: it stops ultraviolet and visible light alike. So a pale stripe under the mask proves that something in the light reaching that jar caused the darkening — it does not tell you which part of the spectrum, and nothing in CSI's published specifications addresses the spectrum for any wax, dye or fragrance in the range.
Does the distinction matter commercially? Occasionally. If you were choosing between a UV-filtering film on a window and simply moving the rack, knowing would change the decision. In practice the actions that follow are the same either way, because every one of them reduces total light on the wax: an opaque vessel, a closed carton, a shelf away from the window, and less time on open display. So the useful discipline is to stop at the claim the mask supports — exposure — and act on that.
What each test arm actually licenses you to say
Claim, the evidence that supports it, and the claim that goes one step too far
| Claim you can make | Evidence | The overreach to avoid |
|---|---|---|
| "Light exposure is contributing" | A pale strip under the mask with a straight edge | "UV is causing it" — the mask blocked everything, not just UV |
| "Shelf position changes the outcome" | Dark twins clearly behind the exposed units at the same checkpoint | "Dark storage prevents discolouration" — it delayed it in your test, over 60 days |
| "The wax responds to light without fragrance" | An unscented blank developing its own light-side gradient | "Soy is light-sensitive" — you tested one wax, one jar, one room |
| "The fragrance contributes as well" | Overall toning on every face, plus a page naming a responsible material | A rate, an endpoint, or a shade prediction — no page states any |
| "This is cosmetic, the burn is unchanged" | Two-hour burns matching the fresh record on pool time, soot and flame | "The stock is fine to sell for X months" — that is a shelf-life claim you have not earned |
There is no additive to buy for this
It is worth saying plainly: CSI does not list a UV inhibitor, a UV absorber or a colour stabiliser. No product in the catalogue is one, so there is nothing we can sell you that goes into the wax to solve this. The additives listed are stearic acid (100 gm and 200 gm only) and Vybar (50g and 100g only), and neither page describes any effect on colour stability. Anyone selling you a colour-protecting additive for candles should be asked what their own page states about it.Six readings a jar, and mapping the rack
The unit of analysis here is not the candle — it is the face and the height. A single "shade" per jar throws away exactly the information that distinguishes the two causes, so record six.
The six-point reading · per jar, per checkpoint
What each of the six points is for and the pattern that means something
| Point | Where | Pattern worth noticing |
|---|---|---|
| 1 | Exposed face, top third | Usually the worst point if a window is above shelf height |
| 2 | Exposed face, middle | The reference point for the face-to-face comparison |
| 3 | Exposed face, bottom third | Pale bottom with a dark top is a strong directional signal |
| 4 | Opposite face, top third | If this matches point 1, the cause is not directional |
| 5 | Opposite face, middle | The straight comparison against point 2 — the headline number |
| 6 | Opposite face, bottom third | With point 3, tells you whether the gradient is vertical too |
Then map the rack, because the same six readings across positions turn one candle's story into the batch's story. Record, for every carton: shelf number, row, how far from the window, which way the fronts face, whether the carton was open or closed, and whether anything warm sits nearby. Two hours of mapping tells you which shelves need a carton and which need nothing — and that is a cheaper intervention than changing a single material. It also feeds straight into the stratified sampling you will do on the next batch.
14 units and ₹3,285.33: the arithmetic
Costed on a 500-unit run of 150 g candles in Clear Glass Jars with Golden Lid, poured from Luxury Soy Wax Chunks with Sandalwood at 8% — an oil whose page states 0% vanillin, chosen deliberately so the fragrance candidate is already documented away. Materials only.
Test cost against batch value · CSI live pricing, September 2026
Twelve withheld units, two poured blanks, and what changing the vessel would cost instead
| Line | Basis | Cost |
|---|---|---|
| Wax in one 150 g candle | 138 g at ₹599/kg = ₹0.599/g | ₹82.66 |
| Oil in one candle | 12 g of Sandalwood at 1 kg pricing (₹5.0268/g) | ₹60.32 |
| Jar | Clear Glass Jar with Golden Lid 150 gram, pack of 10 at ₹944 | ₹94.40 |
| Wick | Eco Candle Wicks Thin (C1), 100 at ₹590 | ₹5.90 |
| Materials per candle | Sum of the four lines | ₹243.28 |
| 500-unit batch | 500 × ₹243.28 | ₹1,21,641.80 |
| 12 units withheld for arms 1–3 | 12 × ₹243.28 | ₹2,919.40 |
| 2 unscented blanks poured fresh | 2 × (₹82.66 + ₹94.40 + ₹5.90) | ₹365.92 |
| Whole test | 2.70% of the batch's materials value | ₹3,285.33 |
| Masking material | Card or foil and tape from the workshop | ₹0 |
| Opaque swap, 70 g votives | White Matte Votive ₹31.86 vs Clear Votive ₹31.86 | ₹0 per unit |
| Opaque swap, larger candle | Brown Matte ₹70.80 vs the 150 gram clear jar ₹94.40 | Saves ₹23.60 per unit · ₹11,800 over 500 |
Worked out above: 150 g candle at an 8% load = 138 g wax + 12 g oil. Wax ₹0.599/g × 138 = ₹82.66 · Sandalwood ₹5.0268/g × 12 = ₹60.32 · jar ₹944 ÷ 10 = ₹94.40 · wick ₹590 ÷ 100 = ₹5.90 · total ₹243.28. Batch 500 × ₹243.28 = ₹1,21,641.80. Twelve withheld units 12 × ₹243.28 = ₹2,919.40; two blanks 2 × ₹182.96 = ₹365.92; test total ₹3,285.33 = 2.70% of the batch. Vessel swap: ₹94.40 − ₹70.80 = ₹23.60 per unit, × 500 = ₹11,800. The Brown Matte and White Matte Glass Jars state a fill weight of 200 ml and dimensions of 8 cm height by 7 cm width, against a 150 gram fill on the clear jar — they are not a like-for-like swap: weigh a filled jar and re-wick before switching a range.
Two figures to hold together. The test costs 2.70% of the batch, and the most effective fix for small candles costs nothing at all — matte white votive glass and clear votive glass are the same ₹31.86 with the same stated ~70g fill. It is rare in manufacturing for the obvious intervention to be free. When it is, the only reason not to take it is aesthetic, and that is a decision you should make deliberately rather than by default.
The vessel, the carton and the shelf
Three levers, none of them chemical, ranked by what they cost you.
The shelf is free: move the rack away from the window, turn the fronts to face the wall, and stop leaving the top row out as a display. The carton is nearly free: closed boxes on the shelves that get light, and stock kept in its outer packaging until it ships. The vessel costs somewhere between nothing and ₹23.60 a unit, and it is the only one of the three that follows the candle into the customer's home.
1
The free swap · same price, same stated fill
White Matte Votive Jar 70 gram
The single most efficient change available in this entire cluster. Its page states a capacity of ~70g wax fill — the same figure as the clear votive — and it lists at exactly the same ₹31.86 each in packs of 5 and 10. Same fill, same price, no light path to the wax. If your range uses votives or tealight-sized candles, there is no cost argument against switching, and your wick and recipe carry over unchanged because the capacity is identical. Keep a few clear votives for your reference set, though: a stability log you cannot see into stops being a log. One CSI customer's note on these is brief and to the point — "Cute jars, I like it."
| Size | Price | Per piece | Jars per pack |
|---|---|---|---|
| Pack of 5 | ₹159.30 | ₹31.86 | ≈5 |
| Pack of 10 | ₹318.60 | ₹31.86 | ≈10 |
₹31.86 per jar — identical to the clear votive at the same stated fill Buy matte white votives
2
Opaque and cheaper than clear · 200 ml
Brown Matte Glass Jar
For candles above votive size, the matte range is the straightforward answer and it undercuts the clear jar. The page states a fill weight of 200 ml and dimensions of height 8 cm, width 7 cm, at ₹70.80 each — ₹23.60 less than the 150 gram Clear Glass Jar with Golden Lid, which is ₹11,800 across a 500-unit run. Two cautions. Capacity is stated in millilitres rather than grams, so weigh one filled jar before you plan a batch; and a 200 ml vessel is a different diameter and volume from a 150 gram jar, so re-wick and burn-test before you switch a range. The same jar is listed in Black, White, Green, Red, Purple, Orange, Pink, Royal Blue and Maroon at the same price.
| Size | Price | Per piece | Jars per pack |
|---|---|---|---|
| Pack of 5 | ₹354 | ₹70.80 | ≈5 |
| Pack of 10 | ₹708 | ₹70.80 | ≈10 |
₹70.80 per jar · ₹23.60 less than the 150 gram clear jar Buy Brown Matte jars
3
Tinted glass · the smallest and cheapest vessel here
Amber Shiny Glass Jar with Black Lid
Amber glass is the traditional answer to light on a product, and this is the least expensive jar of the three at ₹47.20 each, in packs of 1 and 5. Read the stated figures before you treat that as a saving: the page gives a capacity of 120 gm and 6 cm diameter, 6.5 cm height, so it is a noticeably smaller candle than a 150 gram jar — you are paying less because there is less in it, not because the jar is a bargain. It suits a gift size or a second SKU in a range, and the tinted glass lets the customer still see a little of the wax, which some brands want. As with any change of diameter, re-wick and burn-test.
| Size | Price | Per piece | Jars per pack |
|---|---|---|---|
| Pack of 1 | ₹47.20 | ₹47.20 | ≈1 |
| Pack of 5 | ₹236 | ₹47.20 | ≈5 |
₹47.20 per jar · stated 120 gm capacity, 6 cm diameter Buy amber jars
The CSI principle
A straight edge is a fact. Everything else about a discoloured candle is an argument.
Fragrance dissolves evenly, temperature reaches the whole jar, and wax has no idea where you put the tape. Only light draws a line — which is why a strip of card is the most decisive instrument in this cluster and the cheapest.
Moving a whole range out of clear glass? Matte jars in Brown, Black, White, Green, Red, Purple, Orange and Maroon at ₹70.80 each (pack of 5 ₹354, pack of 10 ₹708), matte white 70 gram votives at ₹31.86, and Amber Shiny Glass Jars at ₹47.20. Bulk pricing, GST invoicing and documentation are handled directly on WhatsApp.
Order in bulk on WhatsApp
Every candle in that carton has the same recipe. Only some of them had a window.
— CandleMakingSuppliesIndia
Why trust this guide
CANDLEMAKINGSUPPLIESINDIA supplies raw materials, not finished candles. The commercially convenient version of this page would sell you an additive. There isn't one: no UV inhibitor, UV absorber or colour stabiliser is listed in our catalogue, and we say so rather than steering you towards something adjacent. The most effective fix we can offer for small candles is a jar that costs exactly the same as the one you are already buying, and the second most effective is free — move the rack.
Every price, pack size, capacity and dimension here comes from live CSI stock in September 2026 and links to the product page, where current pricing always takes precedence. Jar capacities are quoted as the pages state them, in millilitres where that is what the page says — several matte jars state a fill weight of 200 ml rather than a weight in grams, so weigh a filled jar before planning a batch. No CSI page states a shelf life, a storage instruction, a light-stability rating, a discolouration rate or an accelerated-exposure conversion, and none is asserted here; nor do we claim a spectrum, because an opaque mask cannot distinguish ultraviolet from visible light. The four arms, the six-point reading, the 8% planning load and the day 0/14/30/60 checkpoints are our method, labelled as a method.
For help choosing an opaque or tinted vessel for a range, for bulk pricing, GST invoicing, MSDS or IFRA documentation, message us on WhatsApp at +91 7397976926.
Frequently asked questions
How do I tell whether sunlight or the fragrance oil darkened my candle?
By the pattern, then by a mask. Fragrance materials are dissolved through the wax, so they tone it evenly on every face and through its depth. Light reaches one side, so it produces a face-to-face difference, often a vertical gradient, and a batch that tracks shelf position. Tape a card over one face of four units: if a pale strip with a straight edge appears where the card was, light is contributing. Nothing else in a stored candle draws a straight line.
Does UV light specifically cause candle discolouration?
A card or foil mask blocks ultraviolet and visible light together, so the test that most makers can run proves light exposure without isolating the spectrum. No CSI page states a light-stability rating or addresses wavelength for any wax, dye or fragrance, so we will not assert a mechanism. In practice it rarely changes what you do: an opaque vessel, a closed carton and a shelf away from the window all reduce total light, whichever part of it was responsible.
Is there a UV inhibitor I can add to candle wax?
Not from CSI — no UV inhibitor, UV absorber or colour stabiliser is listed in the catalogue, and no product page describes an effect on colour stability. The two additives listed are stearic acid (100 gm ₹57.82, 200 gm ₹115.64) and Vybar (50g ₹156, 100g ₹312), neither of which is offered for this purpose. The levers that do exist are the vessel, the packaging and the placement — and for 70 gram votives, the opaque vessel costs the same as the clear one.
Can I still sell candles that have darkened on one side?
Usually, but grade them by position rather than judging the batch as a whole. A position-driven cause means the batch is not uniform, so draw a stratified sample — front and back of the exposed shelf, inside a closed carton, and from the interior of the stack. Quarantine anything with cracked glass, a wick touching the glass, a clogging wick or a jar uncomfortably hot at two hours. Sort the rest into an acceptable group and a seconds group against two reference photographs, and describe each honestly.
Do amber or opaque jars actually prevent candle discolouration?
They reduce the light reaching the wax, which addresses the exposure cause — they do nothing about fragrance-driven toning, which happens throughout the wax regardless of what the glass does. So an opaque jar is a fix for a one-sided problem and a cosmetic screen for an even one. No CSI jar page states a light-transmission figure, so treat the choice as a matter of degree rather than a specification: matte blocks most, tinted amber less, clear none.
How long should I run the shielded-control test?
Our method is 60 days with readings at days 0, 14, 30 and 60, and a two-hour burn on one unit per arm at the end. That is a defensible working choice rather than a standard, and if your stock routinely sits for six months you should extend it — the mask edge often becomes visible earlier than a whole-jar comparison does, which is part of its value. What you should not do is warm the samples to speed it up: there is no published conversion between accelerated exposure and calendar time, and heat is a separate cause with its own test.
A strip of card, three controls, one decision
The test costs 2.70% of the batch. For 70 gram votives, the fix costs nothing at all.
White Matte Votive Jar 70 gram ₹31.86 each — identical to the Clear Glass Votive Jar at the same stated ~70g fill. Brown, Black and White Matte Glass Jars ₹70.80 each (stated 200 ml fill, 8 cm × 7 cm), ₹23.60 less than the 150 gram Clear Glass Jar with Golden Lid at ₹94.40. Amber Shiny Glass Jar with Black Lid ₹47.20 (stated 120 gm capacity, 6 cm diameter). Luxury Soy Wax Chunks ₹599/kg with a stated 8–13% load; Sandalwood Fragrance Oil ₹5,026.80/kg, 0% vanillin stated. Message us for bulk pricing, GST invoicing and documentation.
Shop containers Ask on WhatsApp
Continue the read
- White vanilla candle brown at three months — is the fragrance causing it?
- Will the colour eventually stabilise? The eight-checkpoint log
- White turned yellow with no vanilla in the scent name
- What to test before choosing fragrances for a white candle collection
- Which candle fragrances are least likely to discolour white wax?
- Liquid colours vs mica powder in candle making
Editorial standards & sources
About this guide: Written by the CANDLEMAKINGSUPPLIESINDIA team. Product recommendations reflect the CSI range; the four-arm shielded-control design, the six-point reading and the stratified inspection apply to any supplier's materials.Customer reviews: The six reviews at the top of this page are genuine, published Judge.me reviews left by CSI customers on their product pages. Names, star ratings, dates and products are as recorded by Judge.me; one longer review is shortened with an ellipsis and otherwise unedited.
Figures verified September 2026: Jar specifications quoted as the product pages state them — Clear Glass Votive Jar 70 gram "Capacity: ~70g wax fill", pack of 5 ₹159.30, pack of 10 ₹318.60 (₹31.86 each); White Matte Votive Jar 70 gram "Capacity: ~70g wax fill", pack of 5 ₹159.30, pack of 10 ₹318.60 (₹31.86 each); Brown Matte Glass Jar "fill weight of 200 ml", "Height 8 cm width 7 cm", pack of 5 ₹354, pack of 10 ₹708 (₹70.80 each); Black Matte and White Matte Glass Jar the same 200 ml fill and ₹70.80; Amber Shiny Glass Jar with Black Lid "Capacity: 120 gm", "6 cm diameter, 6.5 cm height", pack of 1 ₹47.20, pack of 5 ₹236; Clear Glass Jar with Golden Lid (150 gram) pack of 10 ₹944 (₹94.40 each). Capacities given in millilitres are not weights — weigh a filled jar before planning a batch. Fragrance wording quoted verbatim: Sandalwood "Vanillin content 0% - no discolouration, safe for white and neutral wax"; Blue Ocean "Vanillin content 0% - no discolouration, safe for white and light wax". Wax specifications as published: Luxury Soy Wax Chunks "Recommended fragrance load: 8% to 13% of total wax weight", "10% Recommended", add 80–90°C, pour 70–80°C, cure minimum 48 hours ideally 1–2 weeks before burn testing. Additives listed by CSI: stearic acid 100 gram ₹57.82 and 200 gram ₹115.64; Vybar 50g ₹156 and 100g ₹312. No UV inhibitor, UV absorber or colour stabiliser appears anywhere in the CSI catalogue, and no jar page states a light-transmission figure. No CSI page states a shelf life, a storage instruction, a light-stability rating, a discolouration rate, a discolouration endpoint or an accelerated-exposure conversion, and none of those is asserted here; no claim is made about which part of the light spectrum is responsible, because an opaque mask blocks ultraviolet and visible light together. Prices used in maths: Luxury Soy Wax Chunks 1 kg ₹599 (₹0.599/g); Sandalwood Fragrance Oil 1 kg ₹5,026.80 (₹5.0268/g); Eco Candle Wicks Thin (C1) 100 ₹590 (₹5.90 each). Assumptions stated as method, not standards: 150 g finished candle at 8% = 138 g wax + 12 g oil; two unscented blanks require 276 g of wax; four units per arm across three arms plus two blanks = 14 units; checkpoints at days 0, 14, 30 and 60; six readings per jar (two faces at three heights); one two-hour burn per arm at day 60; a 500-unit batch for the stock-at-risk arithmetic. Per-candle materials ₹82.66 + ₹60.32 + ₹94.40 + ₹5.90 = ₹243.28; × 500 = ₹1,21,641.80; 12 withheld units ₹2,919.40; 2 blanks 2 × ₹182.96 = ₹365.92; test total ₹3,285.33 = 2.70% of the batch. Vessel swap ₹94.40 − ₹70.80 = ₹23.60 per unit, × 500 = ₹11,800; the 200 ml matte jars are not a like-for-like replacement for a 150 gram jar and require re-wicking and a fresh burn test. Diwali 2026 is 8 November 2026. Prices and availability change — the linked product pages are always authoritative.