My Candle Passed a Two-Hour Burn Test but Failed After Several Longer Burns — Why Isn’t a Single Short Burn Test Enough for Commercial Candles?
Aktie
Eco C1 ₹59.00 · C2 ₹94.40 for 10 CSI 464 ₹507.40 per kg Blue Ocean 50 g ₹247.00
Passed two hours · failed on longer burns
Approve your candle at the burn length your customers actually use.
★★★★★
"Good fragrance 👍"
Sooraj RVerified buyer · Aug 2026
Blue Ocean Fragrance Oil
★★★★★
"Fresh and soothing"
Yashvi ShahVerified buyer · Jul 2025
Blue Ocean Fragrance Oil
★★★★★
"One of the best wax for container Candles. Easy to work with, especially if you are a beginner."
ThenirvaofficialVerified buyer · Nov 2025
Luxury Soy Wax CSI 464 (Flakes Form) For Container Candles
★★★★☆
"Good quality wax"
Arminder KaurVerified buyer · Oct 2025
Eco Soy CSI 400
★★★★★
"Wax quality are very good"
Sakshi JainVerified buyer · Sep 2026
Luxury Soy Wax Chunks for Jar / Container Candles
★★★★★
"the quality of luxury soy wax and pillar candle wax is very good, and the packaging is also nice and clean. Do give a try guyss ,ig i have found my candle making supplier! And yes their shipment charges were too higb for me! Other wise the quality is top noch"
Mahak agarwalSep 2024
Soy Pillar Wax (Specially made for Pillar and Designer Candles)
★★★★★
"Good fragrance 👍"
Sooraj RVerified buyer · Aug 2026
Blue Ocean Fragrance Oil
★★★★★
"Fresh and soothing"
Yashvi ShahVerified buyer · Jul 2025
Blue Ocean Fragrance Oil
★★★★★
"One of the best wax for container Candles. Easy to work with, especially if you are a beginner."
ThenirvaofficialVerified buyer · Nov 2025
Luxury Soy Wax CSI 464 (Flakes Form) For Container Candles
★★★★☆
"Good quality wax"
Arminder KaurVerified buyer · Oct 2025
Eco Soy CSI 400
★★★★★
"Wax quality are very good"
Sakshi JainVerified buyer · Sep 2026
Luxury Soy Wax Chunks for Jar / Container Candles
★★★★★
"the quality of luxury soy wax and pillar candle wax is very good, and the packaging is also nice and clean. Do give a try guyss ,ig i have found my candle making supplier! And yes their shipment charges were too higb for me! Other wise the quality is top noch"
Mahak agarwalSep 2024
Soy Pillar Wax (Specially made for Pillar and Designer Candles)
Reviews collected and published through Judge.me on candlemakingsuppliesindia.store. They are general reviews of the products named on each card, not assessments of the advice set out below. Wording is unedited.
✓ Prices verified 26 September 2026, stock checked per size ✓ MSDS and IFRA documentation on request on WhatsApp ✓ Raw materials only — CSI does not sell finished candles
CSI Diagnostics · Short Test, Long Failure
A two-hour pass is a pass for two hours. Burn two twins short and two long, up to about four hours, to about 1 cm left, and the faults a short test cannot see will show themselves.
2 h vs 4 h
twin schedules from the same batch, compared at matching depth · CSI live pricing, September 2026
Quick answers — read this first
Why did my candle pass a two-hour burn test and fail later? Because a two-hour burn never sees the second half of a longer burn. In hours two to four, the pool commonly keeps deepening, the wick lengthens and can cap with carbon, the flame can grow, soot can start and the glass keeps heating. A customer who burns for three or four hours meets all of that; your two-hour test met none of it.Is a single burn test ever enough for commercial candles? Not in our judgement. One burn tests one light, at one depth, for one length of time. Commercial approval needs repeated burn cycles at the length your customers will burn, up to about four hours (a common-practice upper limit), and at shorter lengths too, through the jar.
What is the test? Four twins from the same batch: two on two-hour burns, two on long burns up to about four hours, all trimmed and logged at the same checkpoints and run to the common-practice stop at about 1 cm. Faults that appear only in the long twins after hour two are faults a two-hour test cannot catch.
Do I need to buy anything? Usually not for the test: use four unburned candles from the batch that failed. Pouring fresh twins in the worked example (Blue Ocean, CSI 464, 150 g jar, C2) uses ₹932.56 of materials, excluding labour, freight, packaging and GST.
The short answer
Why it passed: a two-hour test watches only the first half of a four-hour burn (50% of it goes unobserved) and the first lights of a candle's life.
The schedule: two twins on two-hour burns, two on long burns up to about four hours, same checkpoints at 1, 2, 3 and 4 hours, all to about 1 cm left.
The rule: fault only in the long twins, after hour two = a long-cycle fault; re-wick and re-approve on long cycles. Fault in both = not burn length. Fault only in the short twins = first-pool memory or relighting.
The cost: nothing with unburned batch candles; ₹932.56 of materials for four fresh twins (worked example), excluding labour, freight, packaging and GST.
In this guide
- Straight answer: what a two-hour test cannot see
- Hours two to four: what changes inside one long burn
- Which faults only long cycles reveal
- The burn-cycle schedule: short twins against long twins
- Reading the twins, and what each verdict costs
- What a commercial burn schedule should include
- Wicks, wax, oil and labels for the schedule
- Frequently asked questions
Two schedules on one candle, drawn to scale. Top: within a single burn, the short twins stop at two hours, so the shaded window where pools deepen, flames grow, carbon caps form and glass heats is seen only by the long twins. Bottom: over the same 24 burn hours (a worked-example window), the short twins are lit 12 times and the long twins 6, so each schedule stresses something different. The four-hour limit is common practice, not a CSI figure.
One step smaller if the long twins fail · C1 ₹59.00 for 10
Eco Candle Wicks: the retest rung after a long-cycle failure
Care labels · 500 for ₹413.00
Candle Care Stickers Roll: put the burn-length instruction on the jar
WhatsApp +91 7397976926
Send your short-versus-long twin log and we will help you read it
Straight answer
My candle passed a two-hour burn test but failed after several longer burns. Why isn't a single short burn test enough for commercial candles?
Because the faults that failed your candle live where a two-hour test never looks. Within one burn, the pool keeps widening and deepening after the first hours, the exposed wick gets longer unless it is trimmed, carbon builds on its tip, and heat accumulates in the wax and the glass. A candle can look calm at two hours and be tall-flamed, sooty or hot at four. Across burns, a single test sees one light at the top of the jar, while your customer lights it again and again, lower each time. So a two-hour pass is a pass for two hours at the top of the jar, nothing more. To find out which of your faults are long-cycle faults, burn four twins from the same batch: two on two-hour burns and two on long burns up to about four hours (a common-practice upper limit), trimmed the same way, logged at 1, 2, 3 and 4 hours and run to about 1 cm left. A fault that shows only in the long twins, and only after hour two, is one your two-hour test could not have caught. The fix is usually a wick one step smaller, re-approved on long cycles, not a different oil.
One line: a two-hour burn tests two hours; approve a commercial candle on repeated burns at the length your customers will use, up to about four hours, alongside shorter ones.
If the long twins fail after hour two: ten Eco C1 wicks (₹59.00, ₹5.90 each) cover a one-step-smaller retest pair with spare. The test itself needs no purchase if you have four unburned candles from the batch. All Eco wick packs are in stock on 26 September 2026.
Buy Eco C1 — ₹59.00
Hours two to four: what changes inside one long burn
At two hours, most candles are still settling into the burn. At four, they are showing you what they really do.
A burn is not steady from the moment the pool reaches the glass. Several things keep changing, and most change in the direction that makes a marginal wick look worse. These are tendencies, commonly reported by makers; how far each goes depends on your wax, wick, oil and jar.
Inside one long burn
What tends to change after the first two hours · judgement, hedged
| What changes | Why it can continue past two hours | What you see at four hours | How to log it |
|---|---|---|---|
| Pool depth | Heat keeps flowing into the wax once the pool is full | A pool well past the 0.5–1 cm rule of thumb | Skewer at 2 h and at the end |
| Wick length | The wick burns down more slowly than the wax around it on some wicks | A longer exposed wick, a taller flame | Flame height against a ruler at each hour |
| Carbon on the wick | Carbon builds up over continuous burning, commonly more with heavy oils or dyes | A cap on the wick tip, a flickering or smoking flame | Note cap: none, small, large |
| Soot | A taller, flickering flame burns less cleanly | A grey band at the rim or on the lid | Wipe and check the glass after each burn |
| Glass heat | The glass keeps absorbing heat from the pool and flame | A higher reading at the same spot than at two hours | Non-contact thermometer; never by touch |
None of these needs a new ingredient to happen; they are what time does to a burning candle. That is why the fix for a long-cycle failure is almost never a different fragrance oil. More detail on each: the depth chart is the deep-pool post, flame growth is the trimmed-versus-untrimmed twin, soot bands are the soot-after-10-hours post and carbon scoring is the mushroom score. This page is about the schedule that lets them show up in the first place.
Glass heat: number, not hand
If your log is to include jar temperature, use a non-contact thermometer at the same spot at 2 h and at the end of each burn. CSI does not list one. The Pen Thermometer CSI sells is for wax (its page: "monitor the temperature of your candle wax"). Never judge glass heat by touching it; compare your own readings over time rather than against a number from elsewhere.Which faults only long cycles reveal
Some faults need long burns to appear. A few need short ones. A single test catches neither reliably.
The table sorts common late failures by which schedule tends to expose them. The sorting is editorial judgement from how burns behave, not measured data; CSI publishes no failure statistics.
Differential table · which schedule reveals what
Most common first within each group (judgement) · L = long twins, S = short twins
| Fault | Tends to show in | Rules a long-cycle cause in | Rules it out |
|---|---|---|---|
| Flame grows tall late in a burn | L, after hour 2 | Calm at 2 h in both; tall only in L's later hours | Tall at 1 h in both |
| Pool far past 1 cm deep | L, rising burn on burn | S pools stay near target at the same depth | S pools just as deep |
| Carbon cap, smoking flame | L, hours 3–4 | Cap forms only after hour 2, returns after trimming | Cap at 1 h, or in S too |
| Soot band on rim or lid | L | Clean glass after S burns, grey after L burns | Soot after both |
| Glass reading climbing | L, worst low in the jar | L's end-of-burn reading above its 2 h reading, burn after burn | Readings flat through each burn |
| Tunnel or memory ring at the top | S | S leaves hard wax at the glass after burn 1; L doesn't | Both reach the glass |
| Hard to relight, or drowns on lighting | S (more lights) | Problems cluster at lighting, not late in a burn | Lights cleanly every time |
| Faults only low in the jar | Both, at depth | Appears at the same depth on either schedule | Appears at any depth on L only |
The first five rows are long-cycle faults, and they are the likeliest story behind "passed two hours, failed later". The two S rows are the reverse problem, which is why the schedule keeps two short twins rather than dropping short burns altogether. The last row is depth, not length: it belongs to the acceptance-gates post and the late-flame hub.
Mistake: fixing a long-cycle failure by printing "burn for no more than 2 hours" on the label. What tends to happen: customers commonly burn for an evening, and a candle that is only safe for two hours is likely to meet a three- or four-hour burn sooner or later. Fix: approve the candle at the longest burn your label allows (about four hours is common practice) and put that length on the label. A label that asks for shorter burns than people use is a hope, not a control.
The burn-cycle schedule: short twins against long twins
Four candles from one batch, one variable: how long each burn lasts.
S1 and S2 burn for two hours each session, exactly the test the candle passed. L1 and L2 burn until the pool reaches the glass and then on, up to about four hours, the common-practice upper limit. Everything else stays the same: wax, oil, load, wick, jar, trimming, room. Best of all, the four are unburned candles from the batch that failed, so they are at least as old as any fresh pour and match what your customers bought.
If you have to pour fresh twins
Worked example: 150 g candles at 8% of total weight in CSI 464, 12 g of oil and 138 g of wax each (8% of total is 8.70% of wax weight), inside Blue Ocean's "up to 10%" and CSI 464's "up to 10%" even read on wax weight (9.09% of total). Four twins take 48 g of oil and 552 g of wax. Pour at 80–85°C in the 150 g jar (CSI 464 states 80–90°C; the jar page "Safe for hot pour up to 85°C"). Blue Ocean's page says to cure soy candles 48–72 hours before burn testing; many makers start at day 7 (common practice).
Bill of materials · four twins · worked example
Only if you have no unburned candles from the failing batch · CSI live pricing, 26 September 2026
| Item | Size bought | Used | Cost of what is used |
|---|---|---|---|
| Blue Ocean Fragrance Oil | 50 g, ₹247.00 (₹4.94/g) | 48 g (2 g left) | ₹237.12 |
| Luxury Soy Wax CSI 464 | 1 kg, ₹507.40 (₹0.51/g) | 552 g (448 g left) | ₹280.08 |
| Clear Glass Jar with Golden Lid (150 gram) | Pack of 10, ₹944.00 | 4 jars | ₹377.60 |
| Eco Candle Wicks, Thick (C2) | 10 wicks, ₹94.40 | 4 (worked example: the wick that passed) | ₹37.76 |
| Four twins, materials | 4 candles | ₹932.56 (₹233.14 each) |
Costs exclude labour, freight, packaging and GST. Starting from nothing, the cash outlay is ₹1,792.80. The 50 g bottle is exactly enough with 2 g spare, so weigh carefully or buy a second bottle if a retest pair will follow in the same oil.
Running the schedule
1
One burn per candle per sessionLight S1 and L1 on the same day in the same still room, on a level surface, well apart and away from fans; S2 and L2 on alternate days if space is short. Burn within sight, never unattended. Let each candle cool fully before the next light.
2
Trim every wick the same way before every burnThe trimmer page's tip is "Trim your wick to 1/4 inch before every burn"; any fixed length will do if all four get it. Trimming the same removes wick length as a difference between S and L at the start of each burn.
3
Log at 1, 2, 3 and 4 hoursPool width (or "edge"), pool depth with a skewer, flame height against a ruler, carbon cap (none, small, large), soot on the glass, and glass temperature at one marked spot with a non-contact thermometer if you have one. S candles are logged at 1 and 2 hours only; L at every checkpoint.
4
Wipe and check after each burnOnce cool, note any soot band and clean it off so the next burn shows its own. Note wax height, so depth can be matched between S and L later.
5
Run all four to about 1 cmMany makers stop with about 1 cm of wax left (common practice). The S twins take more sessions to get there. How many candles and depth gates a formal approval needs is the depth-gates post; here the aim is to compare the two schedules at matching depths.
6
Compare at matching depth, not matching sessionAfter ten sessions L is far lower in the jar than S. Compare L's burn in the middle third with S's burns in the middle third, and so on. Otherwise you will read depth as burn length.
Mistake: burning the long twins for six or eight hours "to be thorough". What it does: it tests a use most care cards warn against, and fails candles that are fine within the common-practice limit. Fix: cap the long twins at the longest burn you will print on the label, about four hours in common practice. If you suspect customers burn longer, change the label and the approval together.
Reading the twins, and what each verdict costs
The twins don't tell you what to buy. They tell you whether burn length is the story.
Decision rule · short twins against long twins
Read at matching depths · duplicates must agree before you act
| S twins | L twins | What it points to | Next step | Purchase |
|---|---|---|---|---|
| Pass | Fail after hour 2 (flame, depth, carbon, soot or heat) | A long-cycle fault: the wick is marginal for long burns in this jar | One step smaller wick, approved on the same S/L schedule (3256 for narrowing jars; 3244 for final-third criteria) | C1 or C2, from ₹59.00 for 10 |
| Pass | Fail within the first 2 hours too | The two-hour test did see it; the first log missed it | Re-read the original test log; look at flame and soot at 1–2 h | Nothing yet |
| Fail at the top (tunnel, memory ring) | Pass | Short burns underserve the first pool | A first-burn instruction on the label; weigh it with 3288 | Labels, if you have none |
| Fail at the same depth | Fail at the same depth | Depth, not burn length | Depth-stage map (3241); pool chart (3242) | Nothing yet |
| Pass | Pass | The failure came from conditions beyond your test: burns past about 4 h, draughts, no trimming | Ask the customer how it was burned; put burn length and trimming on the label | Labels, if you have none |
| Duplicates disagree | Undecided | Two more twins on the schedule that disagreed | Nothing | |
The first row is the classic answer to this title, and the purchase it points to is small. If C1 replaces C2 in production, it also costs ₹3.54 less per candle; that is incidental. The re-approval must use the same two schedules, because a smaller wick fixes the long twins by giving less heat, and less heat is exactly what can make the short twins tunnel at the top.
What not to buy: a different fragrance oil, when the long-twin faults are mostly about heat and wick behaviour; Vybar or another additive to "stabilise" a long burn (its page speaks of fragrance retention, surface, sweating, hardness and "burn quality" in general terms, results vary by wax, and nothing on it addresses a flame that grows late in a burn); a bigger bottle of Blue Ocean for the retest, when larger sizes are no cheaper per gram; a thermometer that is really for wax, to read glass. CSI does not list a non-contact thermometer.
When the right purchase is nothing: if both schedules pass to about 1 cm, the candle you make is sound up to the four-hour limit, and the failure you heard about came from a use outside it. In our judgement that is common with customer reports. Ask how long it was burned and whether the wick was trimmed, and put both on the label.
What a commercial burn schedule should include
A commercial candle is approved on the way people use it, not the way that is convenient to test.
Short tests have a place: a two-hour first burn is a quick screen for obvious failures, and screening many scents at once is the 20-fragrance plan. What they cannot do is approve. In our judgement, a commercial approval for a container candle includes, at minimum:
Minimum burn schedule for approval
Judgement, built on common practice · adapt the lengths to your own label
| Element | Why | What catches it if you skip it |
|---|---|---|
| A first burn to a full pool | Sets the memory for every later burn | Tunnelling complaints |
| Repeated long burns, up to the longest your label allows (about 4 h common practice) | Hours 2–4 are where heat, carbon and soot build | The failure in this title |
| Repeated short burns alongside | More lights, less time per burn; tests relighting and memory | Tunnels from customers who burn briefly |
| Every burn trimmed and logged at fixed checkpoints | So S and L can be compared at matching depth | Nothing: the data is lost |
| All the way to about 1 cm left | Heat and flame change as the level falls | Late-jar failures (the late-life catalogue) |
| Duplicates for every arm | One candle can be an odd pour | A decision on a fluke |
The commercial case for burning glass all the way down, including complaints and returns, is why final-third testing matters. The cost of this schedule is time more than money: the long twins finish in roughly half as many sessions as the short twins, and both run for weeks. Start it before the season, not during.
Wicks, wax, oil and labels for the schedule
Four items: the wick rungs, the worked-example wax and oil, and the label that carries the burn-length instruction. Chosen on page statements, price per unit and stock on 26 September 2026; CSI has no measured burn data, so nothing is ranked on performance. The oil table shows every size, 150 g candles at 12 g, and 48 g four-twin sets.
1
wick · the rungs if the long twins fail
Eco Candle Wicks — Thin (C1) and Thick (C2)
The twins must carry the wick that passed the two-hour test, and if the long twins fail with a growing flame, a deep pool or late soot, the next retest is one step smaller. In the Eco range those rungs are C2 and C1. The page describes wicks from "natural fibers like cotton and paper" that "pair perfectly with soy wax" and claims "minimal soot or smoke"; that is the page's claim for the wick, and whether your candle delivers it over a four-hour burn is what this test measures. Every pack is in stock on 26 September 2026 at ₹5.90 (C1) and ₹9.44 (C2) a wick. Argued against our own interest: if you still have unburned candles from the batch that failed, the twins cost nothing and you need no wicks at all until the log says so.
| Size | Price | Per unit | What it covers |
|---|---|---|---|
| Thin (C1) / 10 | ₹59.00 | ₹5.90 | the one-step-smaller retest pair if C2 fails the long twins, eight spare |
| Thin (C1) / 100 | ₹590.00 | ₹5.90 | the same per wick; production only |
| Thick (C2) / 10 | ₹94.40 | ₹9.44 | four twins on the wick that passed the two-hour test (worked example) |
| Thick (C2) / 100 | ₹944.00 | ₹9.44 | the same per wick; production only |
Four twins on C2: ₹37.76. Buy C1 — ₹59.00
2
wax · container soy · the worked-example wax
Luxury Soy Wax CSI 464 (Flakes Form) For Container Candles
The page states "Fragrance Load Up to 10%" and "Pour Temperature 80°C – 90°C", and claims "Strong scent throw (both cold and hot)". In the 150 g jar, whose page says "Safe for hot pour up to 85°C", pour at 80–85°C. Price is flat at ₹0.51 per gram from 1 kg to 10 kg; the 500 g costs ₹0.52 per gram and is too small for four twins. Argued against our own interest: the twins must be poured in the wax your failing candle used. If that was another wax, use it; a long-burn result in CSI 464 says little about a candle poured in something else.
| Size | Price | Per unit | What it covers |
|---|---|---|---|
| 500 g | ₹260.00 | ₹0.52 per g | not enough for four twins (552 g) |
| 1 kg | ₹507.40 | ₹0.51 per g | four twins, 448 g left for a retest pair |
| 5 kg | ₹2,537.00 | ₹0.51 per g | the same per gram; after re-approval |
| 10 kg | ₹5,074.00 | ₹0.51 per g | the same per gram; production |
Four twins: 552 g = ₹280.08. Buy 1 kg — ₹507.40
3
fragrance oil · fresh aquatic · the worked-example oil
Blue Ocean Fragrance Oil
A light, fresh oil: a fair worked example, because a candle that fails long burns in a light oil is failing on the wick and jar, not on a heavy fragrance. The page states "candles (up to 10%)", describes "sea salt and ozone top notes, jasmine and lily of the valley heart, and driftwood and musk base", and its FAQ says "Cure soy wax candles for 48-72 hours before burn testing". The page describes it as phthalate-free (page wording). Its FAQ also says to add fragrance "typically 60-65°C for soy wax"; CSI 464's own page states 80–90°C, and the wax maker's figure governs. Every size is in stock on 26 September 2026; the 50 g covers four twins with 2 g spare. Argued against our own interest: Blue Ocean is fractionally dearer per gram at the larger sizes (₹4.94 at 50 g, ₹4.96 at 500 g and 1 kg), and the 1 kg costs exactly the same as two 500 g packs. There is no bulk saving to chase here.
| Size | Price | Per gram | 150 g candles at 8% | Four-twin sets (48 g each) |
|---|---|---|---|---|
| 15 g | ₹93.22 | ₹6.21 | 1 | none (15 g of the 48 g) |
| 50 g | ₹247.00 | ₹4.94 | 4 | 1 (+2 g) |
| 100 g | ₹495.00 | ₹4.95 | 8 | 2 (+4 g) |
| 500 g | ₹2,478.00 | ₹4.96 | 41 | 10 (+20 g) |
| 1 kg | ₹4,956.00 | ₹4.96 | 83 | 20 (+40 g) |
Four twins: 48 g = ₹237.12. Buy 50 g — ₹247.00
4
labelling · the burn-length instruction your customer sees
Candle Care Stickers Roll
If the twins show your candle is fine up to about four hours and fails beyond it, the customer's burn length becomes part of the product, and it belongs on the label. The page describes "Candle Care Stickers" in two rolls, "1 inch500 Stickers in a single roll" and "1.5 inch1000 Stickers in a single roll" (as written). It does not show the printed wording in the text we captured; ask on WhatsApp whether it includes a burn-time line before you rely on it. Argued against our own interest: if you already print your own labels, add the line there and skip this. And a label is not a fix for a candle that fails at the length many people burn; that one needs a wick change.
| Size | Price | Per unit | What it covers |
|---|---|---|---|
| Pack of 500 (1 inch) | ₹413.00 | ₹0.83 | one care label per candle for 500 candles |
| Pack of 1000 (1.5 inch) | ₹699.00 | ₹0.70 | a larger sticker and a lower price per sticker |
From ₹0.70 a label on the larger roll. Buy 500 — ₹413.00
Diwali is 8 November 2026, 43 days from 26 September 2026. A long-and-short schedule to about 1 cm takes weeks, and a re-wick adds another round. If this candle is in your Diwali range, start the twins this week. Send us your log for a quote on wicks, wax, jars and oil with a GST invoice and dispatch date.
WhatsApp a Diwali quote
The CSI principle
Approve a candle at the burn length your customer will use.
Short burns screen; long and short burns together, repeated to about 1 cm, approve. A two-hour pass is a pass for two hours.
"Very little about a candle is settled at two hours. The third and fourth hours are where the wick shows you what it really does."
— CandleMakingSuppliesIndia
Why trust this guide
CandleMakingSuppliesIndia sells the wicks, wax, oil and labels named here, and does not sell finished candles. This page still tells you that the test usually needs no purchase, that Blue Ocean's larger sizes are no cheaper per gram, that our care stickers are optional if you print your own labels, and that a label is not a fix for a candle that fails at normal burn lengths.
Every price and per-unit figure was verified on CSI's live store on 26 September 2026; every size in the pick tables is in stock on that date, and the tables are built to flag any that is not. Load, cure, temperature and product wording is quoted from the product pages, including where two pages disagree (Blue Ocean's FAQ and CSI 464 on temperature); where a page is silent in the text we captured (the care stickers' printed wording), we say so.
The fault sorting, the schedule and the decision rule are editorial judgement; the four-hour limit and 1 cm stop are common practice; the melt-pool depth is a commonly cited rule of thumb; the 24-hour window in the diagram is a worked example; CSI publishes no burn measurements. For bulk pricing, GST invoicing, and MSDS and IFRA documentation on request, message us on WhatsApp at +91 7397976926.
Frequently asked questions
How long should a candle burn test be?
Long enough to match how customers burn: many makers test repeated burns up to about four hours, a common-practice upper limit, alongside shorter burns, all the way to about 1 cm of wax left. A single two-hour burn only screens for obvious faults.
Why does my candle flame get bigger after a few hours?
After the first hours the pool keeps deepening, the exposed wick can lengthen and carbon can build on its tip, so the flame commonly grows. If a trimmed wick still grows tall late in every long burn, the wick is likely marginal for long burns in that jar; test one step smaller.
Is a 2 hour burn test enough before selling candles?
Not in our judgement. It sees one light, near the top of the jar, for half of a typical evening's burn. Approve on repeated long and short burns, trimmed and logged, down to about 1 cm, with two candles per arm.
How many hours should you burn a soy candle at a time?
Common practice is to burn until the pool reaches the edge and not much beyond about four hours at a time, trimming before each burn. Put your own limit on the label, and approve the candle at that limit.
Can a candle pass one test and fail the next?
Yes. A first burn at the top of the jar can pass while later, longer or lower burns fail from heat build-up, carbon or a deepening pool. That is why approval needs repeated burns on duplicates, not a single test.
Should I use a smaller wick if my candle fails long burns?
Often, yes, if two short-burn twins pass and two long-burn twins fail after hour two. Re-approve the smaller wick on both schedules, because less heat can fix the long burns and cause tunnelling on the short ones.
Before you re-approve
Burn two twins short and two long, to about 1 cm, and compare at matching depth.
Use four unburned candles from the failing batch if you have them; otherwise the worked example uses ₹932.56 of materials. Fault only in the long twins after hour two: one wick step smaller, re-approved on both schedules. Send us your log on WhatsApp.
Buy Eco C1 — ₹59.00 Send your twin log on WhatsApp
Continue the read — burns correctly at first, then goes wrong
- My Candle Burns Perfectly During the First Test but the Flame Becomes Too Large Halfway Down the Jar — Why Does Wick Behaviour Change as the Candle Burns Lower?
- How Far Down Should I Burn a Test Candle Before Deciding the Wax, Wick and Jar Combination Is Commercially Acceptable?
- My Wick Starts Mushrooming Only After Several Burn Cycles — Should Wick Testing Continue Until Almost All the Wax Is Consumed?
- My Candle Burns Perfectly for the First 10 Hours but Starts Producing Soot Later — What Changes as the Candle Burns Deeper into the Container?
- My Candle Flame Gets Larger as the Wax Level Falls — Is Heat Building Up Inside the Container and Changing the Burn?
- My Candle Jar Is Safe During the First Half but Becomes Extremely Hot Near the Bottom — Should I Use a Smaller Wick Even if That Causes a Slower Initial Melt Pool?
- My Candle Uses Up Wax Much Faster During Later Burns than Early Burns — Is This a Sign of Excessive Heat Accumulation?
- What Problems Only Appear During the Second Half of a Candle’s Life and Would Be Missed if I Test Only the First Melt Pool?
Editorial standards & sources
About this guide: part of CSI's cluster on candles that burn correctly at first and then go wrong (3241–3260). This page owns the burn-cycle schedule that compares two-hour and longer burns (up to about four hours, common practice) on twins, the sorting of faults by the schedule that reveals them, and a decision rule. How far down to test and how many candles per combination are 3258; mushroom scoring is 3247.Customer reviews: The six reviews at the top of this page are genuine, published Judge.me reviews left by CSI customers on the product pages named on each card — Blue Ocean Fragrance Oil, Eco Soy CSI 400, Luxury Soy Wax CSI 464 (Flakes Form) For Container Candles, Luxury Soy Wax Chunks for Jar / Container Candles, Soy Pillar Wax (Specially made for Pillar and Designer Candles). They are general product reviews, not assessments of the diagnostic advice on this page. Names, star ratings, dates and products are as recorded by Judge.me and wording is unedited. "Verified buyer" appears only on reviews Judge.me recorded as verified — Sooraj R, Yashvi Shah, Thenirvaofficial, Arminder Kaur, Sakshi Jain. The reviews from Mahak agarwal are published but not recorded as verified, and carry no badge. Reviews below five stars are included as published, not filtered out.
Figures verified 26 September 2026, CSI live pricing: Blue Ocean Fragrance Oil 15 g ₹93.22 (₹6.21/g), 50 g ₹247.00 (₹4.94/g), 100 g ₹495.00 (₹4.95/g), 500 g ₹2,478.00 (₹4.96/g), 1 kg ₹4,956.00 (₹4.96/g); Luxury Soy Wax CSI 464 500 g ₹260.00, 1 kg ₹507.40, 5 kg ₹2,537.00, 10 kg ₹5,074.00; Eco Candle Wicks Thin (C1) 10 ₹59.00, 100 ₹590.00; Thick (C2) 10 ₹94.40, 100 ₹944.00; Clear Glass Jar with Golden Lid (150 gram) Pack of 10 ₹944.00; Candle Care Stickers Roll 500 (1 inch) ₹413.00, 1000 (1.5 inch) ₹699.00; Pen Thermometer For Candle Making ₹354.00. All in stock on 26 September 2026. Per gram, per wick, per jar and per sticker = price ÷ units, two decimals; worked costs use the exact per-unit price, then round.
Non-price figures: load is a percentage of total candle weight (150 g at 8% = 12 g oil + 138 g wax). Ceilings and temperatures are as stated on the product pages (Blue Ocean candles up to 10%; CSI 464 up to 10%, pour 80–90°C; 150 g jar hot pour up to 85°C; Blue Ocean's FAQ add figure of 60–65°C is quoted, and the wax page governs) and are formulation limits, not regulatory limits. The four-hour burn limit and 1 cm stop are common practice; the 0.5–1 cm pool depth is a commonly cited rule of thumb; the 24-hour window and light counts are a worked example; the 50% unobserved share is arithmetic on a two-hour test within a four-hour burn. The fault sorting and decision rule are editorial judgement. Costs exclude labour, freight, packaging and GST. Diwali 8 November 2026 is a calendar fact.