My Candle Has Good Adhesion During Summer but Develops Large Patches During Winter — Why Can Colder Temperatures Increase Contraction?
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Is it the cold room or the cold glass? Test both: one arm sets in a warmer room on cold glass, another on warmed glass in the winter room.
Should I pour hotter in winter? It makes the drop bigger, not smaller. Stay inside the wax page's range and change the glass or the room instead.
What does the test cost? With your own stock, little more than a surface thermometer. From scratch, fifteen Mini jars with CSI 464, Cinnamon Vanilla, wicks and IPA are ₹1,521.80. See the kit.
Why winter shows patches summer did not, and the first test
A wet spot is commonly described as a thin air gap where wax has separated from the glass. It reads dark and damp through clear glass, but nothing is liquid. In general candle-making practice, wax contracts as it cools and crystallises, and makers commonly find that the bigger and faster the cooling, the more often it pulls away from the glass. Summer and winter in a north Indian workshop give the same pour two very different journeys: from your pour temperature down to a warm room, or down to a cold one.
Put example numbers on it. Pour CSI 464 at 85°C, inside its page's 80–90°C range. In an example summer room at 32°C, the wax falls 53°C to reach room temperature; in an example winter room at 14°C, it falls 71°C — 18°C further, or 34% more temperature drop. That is arithmetic on temperatures, not a contraction figure: we publish no contraction or shrinkage percentage for any wax and would not convert one into the other. But it shows why winter is commonly described as harder on adhesion. The wax has further to fall, the glass it lands on is colder, and a cold room usually cools it faster. Your readings replace these examples.
Three things changed at once — the size of the drop, the temperature of the glass, and the speed of cooling — so the first test pulls them apart. Pour fifteen Mini jars from one winter batch. Five cool in your normal winter room on cold glass (arm A). Five are poured onto the same cold glass but carried straight to a warmer room to set (arm B). Five are poured onto glass you have warmed to a measured temperature and then cool in the winter room (arm C). If B is clean, the room is your lever. If C is clean, the glass is. If both are, pick the cheaper fix.
| Condition | Summer (example) | Winter (example) | Your summer | Your winter |
|---|---|---|---|---|
| Workshop room at pour time | 32°C | 14°C | ___ | ___ |
| Wax pour temperature (Pen Thermometer) | 85°C | 85°C | ___ | ___ |
| Drop from pour to room | 53°C | 71°C | ___ | ___ |
| Glass temperature before pour | Close to room | Close to room — colder | ___ | ___ |
| Surface the jars stand on | Your bench | Same bench — colder | ___ | ___ |
| Time until the top sets (your watch) | ___ | ___ | ___ | ___ |
| Where jars cool (fan, window, door) | ___ | ___ | ___ | ___ |
Why colder conditions can increase contraction at the glass
In general candle-making practice, molten wax is described as contracting as it cools and contracting further as it crystallises into a solid. A bigger temperature drop means more total cooling for the wax to accommodate. Where the wax stays bonded to the glass while it contracts, the strain is taken up inside the wax, and the wall looks clear. Where the contact is weak, the wax is pulled inwards away from the glass and an air gap opens. Makers commonly see winter patches start low on the jar, near the base, or on the side nearest a cold wall or door — the places that cool first.
Cold glass adds a second effect. Wax that touches glass well below its own temperature is commonly described as setting almost instantly at the wall, before the rest of the candle has settled; the first skin may never wet the glass properly. The cold-glass post takes that mechanism apart in detail, and the preheating post covers whether to warm jars. The third effect is speed. A cold room usually cools the whole candle faster and less evenly, so the outer wax may be solid while the core is still contracting and pulling. Cooling under an AC is the summer version of the same speed problem.
Small jars magnify all three. A Mini 40 ml candle holds very little heat, so it cools quickly in any room and much more quickly in a cold one — and a wedding favour on a table is looked at closely from every side. That makes these jars a demanding test of your winter process. It also means a result from a 30 g Mini jar may not transfer to a 200 g jar: a larger candle holds its heat longer. Test in the jar you sell, and if you sell several, test the smallest and the largest.
The winter ladder
The full series ladder runs from "is it really a wet spot?" through glass cleanliness, glass and pour temperature, cooling, storage and courier, fragrance and dye, jar glass and the wax. Winter-only patches point at the middle of that ladder — glass temperature and cooling — so start there, after one quick check that nothing else changed with the season.
| Rung | Suspect | Single test | Cost |
|---|---|---|---|
| 1 | Did anything else change? | Check wax lot, oil lot, jar lot, cleaning product and staff against your summer records | Nothing |
| 2 | The cold room | Arm B: cold glass, cooled in a warmer room | A warmer space you already have |
| 3 | The cold glass | Arm C: glass warmed to a measured temperature, cooled in the winter room | A non-CSI surface thermometer |
| 4 | The cold bench | Jars set on a board or rack instead of stone or steel | A board you already have |
| 5 | Oil and load | Unscented and 6% jars beside 8% jars in winter conditions | Wax + oil |
| 6 | Wax–jar pairing | A second CSI container wax through the same winter arms | One 500 g or 1 kg bag |
Rung 1 catches more winter problems than you would expect. Wax, oil and jars are often reordered in October and November ahead of Diwali and the wedding season, and a new lot or a new cleaning routine can coincide with the first cold week. If anything changed, test that first. Rung 4 is the cheapest physical fix: the cold-surface post covers stone and steel benches and the insulate-or-rack post compares the options. Raw materials or workshop? is the full method for separating a lot change from the season.
The three-arm winter test
The worked example is CSI's clear Mini Glass Jars 40 ml with a black lid. Its fill weight is not published — 40 ml is the brim volume. With a labelled approximate 0.86–0.90 g of wax per ml, a brim fill would be about 34.4 g–36.0 g; this page uses an example fill of 30 g. Weigh your own. At 8% that is 2.4 g of oil and 27.6 g of wax per jar — small enough that a 0.1 g scale matters. The wax is Luxury Soy Wax CSI 464, poured inside its page's 80–90°C range; the Mini jar's hot-pour limit is not published, so follow the jar supplier's guidance and ask us on WhatsApp. The oil is Cinnamon Vanilla, a winter and festive scent.
| Checkpoint | Arm A · cold glass, winter room | Arm B · cold glass, warmer room | Arm C · warmed glass, winter room |
|---|---|---|---|
| Pour | Glass + wax + room readings | Glass + wax readings; move | Warmed-glass + wax + room readings |
| 2 hours | Photo | Photo + warmer-room reading | Photo |
| 48 hours | Photo + score | Photo + score; return to winter room | Photo + score |
| 7 days | Photo + score | Photo + score | Photo + score |
| 30 days | Photo + score | Photo + score | Photo + score |
Five jars per arm instead of the usual three costs very little in Mini jars — about ₹75.92 of CSI materials per jar in this kit — and it buys you a clearer answer. With three jars, "two spotted against one" is barely a difference. With five, "four against zero" is a pattern you can act on. If you sell larger jars, run the same three arms in your own jar once the Mini screen tells you which lever matters; testing across temperatures before approval shows how to fold winter into a launch matrix.
Wedding favours: what winter patches cost on an order
Here is the material cost of this example favour at production rates: ₹14.00 of CSI 464 (5 kg rate) + ₹10.93 of Cinnamon Vanilla (1 kg rate) + ₹5.90 example wick + ₹21.24 jar (pack of 100 rate) = ₹52.08, excluding labour, packaging, freight and GST. The jar is a real pack-size story: ₹25.96 each in a pack of 5, ₹25.37 in a pack of 25 (black lid) and ₹21.24 in a pack of 100. Everything in italics below is an example to replace.
| Line | Example | Working |
|---|---|---|
| Favours the client needs | 300 | Your order |
| Share spotted under your current winter process | 20% | From your arm A result |
| Favours you must pour | 375 | 300 ÷ (1 − 20%), rounded up |
| Extra favours poured | 75 | 375 − 300 |
| Extra CSI materials | ₹3,905.68 | 75 × ₹52.08 |
| Extra labour | ₹450.00 | 75 × ₹6.00 |
| Cost per clean favour | ₹66.59 | (375 × ₹52.08 + ₹450.00) ÷ 300 |
| Same with no winter patches | ₹52.08 | materials only |
In this example winter patches add ₹14.52 to every clean favour and 75 extra jars to the order — jars you must have in stock before the wedding date. Spotted favours are not wasted, but they cannot go in the client's order. That is why winter is the season to run this test before the orders arrive, not after. The cosmetic-reject cost hub covers the wider economics.
The scoring sheet
Score every jar on one house scale. On a Mini jar the visible wall is small, so a 0–4 grade is easier to use than a percentage. The scale below is an example of a house standard — no industry figure for an acceptable wet spot exists — and your pass line should be decided before the first score. A favour may need a stricter line than a shelf candle, because guests look closely.
| Jar | Arm | Glass °C before pour | Wax °C at pour | Room °C (pour / 1 h) | Where the patch is | Grade 0–4 | Notes |
|---|---|---|---|---|---|---|---|
| 1 | A | ___ | ___ | ___ / ___ | Base / side / near door | ___ | Pour order ___ |
| 6 | B | ___ | ___ | ___ / ___ | ___ | ___ | Warmer room ___ |
| 11 | C | ___ (warmed) | ___ | ___ / ___ | ___ | ___ | Warm-up method ___ |
| 15 | C | ___ (warmed) | ___ | ___ / ___ | ___ | ___ | Last pour |
Write down where each patch sits. Winter patches clustered at the base point to a cold bench; patches on one side point to a door, window or draught; patches all round point to cold glass or a fast overall cool. Wet spots on one side only covers reading the pattern in more detail.
The priced test kit
With your own stock, the winter test costs nothing beyond a surface thermometer. From scratch, here is the fifteen-jar kit with listed, in-stock CSI packs, using oil = W × L and a 5% pour-loss working allowance: 15 × 27.6 g wax = 414.0 g, plus 5% = 434.7 g; 15 × 2.4 g oil = 36.0 g, plus 5% = 37.8 g.
| Item | Need | Buy | Price | Skip if |
|---|---|---|---|---|
| Mini 40 ml jar | 15 jars | 3 × pack of 5 | ₹389.40 | You already hold these jars from one lot |
| Luxury Soy Wax CSI 464 | 434.7 g | 1 × 500 g | ₹260.00 | You hold enough wax from your current lot (better) |
| Cinnamon Vanilla | 37.8 g | 1 × 50 g | ₹271.40 | You test your own production oil (better) |
| Eco Candle Wicks Thin C1 | 15 + 2 spare | 1 × pack of 20 (10-pack out of stock) | ₹118.00 | You use your own approved wick (you should) |
| Wick stickers | 15 | 1 × sheet of 40 | ₹100.00 | You hold stickers |
| Isopropyl Alcohol Spray | Jar wipe for every jar | 1 × 150 ml | ₹383.00 | You already clean jars with a residue-free method |
| Kit total, everything bought | ₹1,521.80 |
That is ₹75.92 of CSI materials per test jar before the IPA spray. The 50 g Cinnamon Vanilla (₹271.40) covers the 37.8 g needed more cheaply than three 15 g bottles (₹318.60). Three packs of 5 Mini jars (₹389.40) are cheaper than one pack of 25 (₹634.25) for a fifteen-jar test; the 25-pack wins once you need more than 25 jars. The Eco Thin C1 line is an example wick only — CSI publishes no wick size for a Mini jar, and a jar this small needs its own burn test.
The decision rule
Apply it after the 30-day checkpoint, from the top, and stop at the first true line.
| If this is true | It means | Do or buy |
|---|---|---|
| A lot, cleaning product or staff change coincided with winter | Maybe not the season | Test that change first (raw materials or workshop?) |
| Arm B clean, arms A and C spotted | The cold room is the lever | Nothing. Set jars in a warmer space or an insulated area; record its reading |
| Arm C clean, arms A and B spotted | Cold glass is the lever | Nothing. Warm glass to a measured, recorded temperature (winter-glass hub) |
| B and C both clean | Either works | Pick the cheaper in labour (the preheating-labour post) |
| All arms spot; unscented or 6% jars do not | Load or oil in the cold | Throw-check the lower load before switching |
| All arms spot at every load; a second wax passes twice | The wax–jar pairing in winter | One 5 kg bag of that wax, then wick, load and throw retests |
| Nothing passes | Clear Mini jars and this winter workshop | Consider a frosted or coloured favour jar (why frosted hides it) |
If CSI 464 is the wax you keep, its price is flat at ₹507.40 a kilo from 1 kg to 10 kg, so buy the 5 kg (₹2,537.00) or 10 kg (₹5,074.00) bag for convenience and stock security, not for a discount. The 500 g bag is ₹260.00 — ₹520.00 a kilo — so it is only the cheaper choice for small test rounds. Anything above 10 kg is quoted on WhatsApp.
The CSI products in this test
| Pack | Price | Per jar |
|---|---|---|
| Pack of 5 | ₹129.80 | ₹25.96 |
| Pack of 25 | ₹634.25 | ₹25.37 |
| Pack of 50 | ₹1,180.00 | ₹23.60 |
| Pack of 100 | ₹2,124.00 | ₹21.24 |
| Pack | Price | Per kg | Candles at 27.6 g wax |
|---|---|---|---|
| 500 g | ₹260.00 | ₹520.00 | 18.1 |
| 1 kg | ₹507.40 | ₹507.40 | 36.2 |
| 5 kg | ₹2,537.00 | ₹507.40 | 181.2 |
| 10 kg | ₹5,074.00 | ₹507.40 | 362.3 |
| Pack | Price | Per gram | Candles at 2.4 g |
|---|---|---|---|
| 15 g | ₹106.20 | ₹7.08 | 6.2 |
| 50 g | ₹271.40 | ₹5.43 | 20.8 |
| 100 g | ₹483.80 | ₹4.84 | 41.7 |
| 500 g | ₹2,301.00 | ₹4.60 | 208.3 |
| 1 kg | ₹4,554.80 | ₹4.55 | 416.7 |
CANDLEMAKINGSUPPLIESINDIA supplies raw materials, not finished candles. The obvious sale in winter is a different wax. This page tells you that the likeliest fixes are a warmer place for jars to set or measured, warmed glass; that the three CSI wax pages with an adhesion claim all make the same one; and that we publish no winter or contraction data for any of them.
Oil prices are CSI live pricing, pulled 24 September 2026, stock re-checked 7 October 2026. Luxury Soy Wax Chunks, CSI 464 and CSI 468 are CSI live pricing, re-checked 7 October 2026; Natural Soy Pearl was re-checked 1 October 2026. Jar and Isopropyl Alcohol Spray prices are CSI live pricing, pulled 7 October 2026; wick prices are re-checked 4 October 2026, including the Eco Thin C1 10-pack being out of stock. Every gram split, per-jar figure and kit total on this page is computed and shown to two decimals so you can check it.
Jar counts per arm, photo checkpoints, temperature-cycle settings, storage temperatures you have not measured yourself, the scoring scale and the pour-loss allowance are labelled working practices or example settings, not industry standards — none exists for wet spots. The 30 g fill for the Mini jar is an example — its fill is not published. Room readings (32°C and 14°C), the 85°C example pour, the glass warm-up range, the favour order (300), spotted share (20%) and labour (₹6.00 per extra favour) are examples you replace. For help building a test kit, bulk quotes, GST invoicing, MSDS or IFRA documents, message us on WhatsApp at +91 7397976926.
Frequently asked questions
- My Candles Have Perfect Glass Adhesion in My Workshop but Develop Wet Spots After Courier Delivery — Are Temperature Cycles Causing the Wax to Separate from the Glass?
- My Candle Looks Perfect at 25°C but Develops Wet Spots When Stored at 35°C — Why Does Temperature Change Affect Adhesion?
- My Candles Cool Directly Under an Air Conditioner and Develop Patchy Adhesion — Could Rapid Cooling Be Responsible?
- Can Placing Hot Candle Jars on a Cold Stone or Metal Surface Cause Adhesion Differences Near the Bottom?
- Should I Insulate the Work Surface or Use Racks When Cooling Premium Clear-Glass Candles?
- How Do I Determine Whether Seasonal Wet-Spot Variation Comes from Raw Materials or Changes in My Workshop Environment?
- My Clear Luxury Candle Jar Shows Ugly Patchy Adhesion Only During Winter — Should I Preheat the Glass, Change Pouring Temperature or Use Another Wax?
- Can Cold Glass Cause Molten Candle Wax to Solidify Too Quickly Against the Jar and Create Poor Adhesion?
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 — Eco Candle Wicks, Premium Candle Wicking Needle and Bamboo Wick Holder. They are general product reviews, not assessments of the guidance set out here. Names, star ratings, dates and products are as recorded by Judge.me and wording is unedited. "Verified buyer" appears only on the three reviews Judge.me recorded as verified — Monika Deep, Subhankar Roy and Sneha Tamang; the reviews from Ashwini, LJ and Lalitha Jagan are published but not recorded as verified, and carry no badge.
Figures pulled 24 September – 7 October 2026: Oils — CSI live pricing, pulled 24 September 2026, stock re-checked 7 October 2026: Cinnamon Vanilla Fragrance Oil ₹106.20 / 15 g, ₹271.40 / 50 g, ₹483.80 / 100 g, ₹2,301.00 / 500 g, ₹4,554.80 / 1 kg. Waxes — Luxury Soy Wax CSI 464 (CSI live pricing, re-checked 7 October 2026) ₹260.00 / 500 g, ₹507.40 / 1 kg, ₹2,537.00 / 5 kg, ₹5,074.00 / 10 kg; Luxury Soy Wax Chunks (CSI live pricing, re-checked 7 October 2026) ₹299.00 / 500 g, ₹599.00 / 1 kg, ₹2,995.00 / 5 kg, ₹5,999.00 / 10 kg; Premium Coconut Soy Wax CSI 468 (CSI live pricing, re-checked 7 October 2026) ₹325.00 / 500 g, ₹650.00 / 1 kg, ₹3,185.00 / 5 kg, ₹6,370.00 / 10 kg. Jars and accessories — CSI live pricing, pulled 7 October 2026: Mini Glass Jars 40 ml, black lid ₹129.80 / 5, ₹634.25 / 25, ₹1,180.00 / 50, ₹2,124.00 / 100; Mini Glass Jars golden lid ₹129.80 / 5, ₹1,180.00 / 25, ₹1,180.00 / 50, ₹2,124.00 / 100; Isopropyl Alcohol Spray ₹383.00 / 150 ml, ₹520.00 / 1 litre. Wicks re-checked 4 October 2026: Eco Candle Wicks Thin C1 ₹118.00 / 20, ₹295.00 / 50, ₹590.00 / 100 (10-pack out of stock); Eco Thick C2 ₹94.40 / 10, ₹188.80 / 20; wick stickers ₹100.00 / 40. Pen Thermometer ₹354.00; Candle Making Weighing Scale ₹354.00.
Non-price figures and assumptions: Load convention: fragrance load is a share of the finished candle (oil = W × L; wax = W × (1 − L)). Mini 40 ml: fill not published; brim × a labelled approximate 0.86–0.90 g/ml = 34.4 g–36.0 g; example fill 30 g at 8% = 2.4 g oil + 27.6 g wax — weigh your own. Temperature-drop arithmetic uses example readings (85°C pour, 32°C and 14°C rooms) and is not a contraction figure. Working practices: 5 jars per arm, alternating pour order, 5% pour loss, example glass warm-up 35–45°C measured, checkpoints at 2 h, 48 h, 7 and 30 days, 0–4 house scale. Per-favour cost uses the CSI 464 5 kg rate, the Cinnamon Vanilla 1 kg rate and the Mini jar pack-of-100 rate. Favour-order figures are placeholders. What CSI's product pages state (quoted, not CSI test results): Luxury Soy Wax Chunks — maximum fragrance load 13%, fragrance addition 80–90°C, pour 75–80°C in the spec table (the step list also shows 70–80°C), stir 2 minutes, cure at least 48 hours, ideally 1–2 weeks, and "excellent adhesion to glass and container surfaces"; Luxury Soy Wax CSI 464 — fragrance load up to 10%, an 80–90°C melt/pour range, "excellent glass adhesion", single-pour, low frosting; Premium Coconut Soy Wax CSI 468 — melting point 50–53°C, pour 58–60°C, fragrance load up to 13%, "formulated for excellent glass adhesion"; Natural Soy Pearl — no fragrance ceiling, temperature, cure or adhesion statement published. Clear Glass Jar with Golden Lid (150 gram) — fill approximately 150 g, "safe for hot pour up to 85°C". All three adhesion statements are the same claim, so they cannot rank the waxes; only a side-by-side test in your jar can. CSI publishes no adhesion, wet-spot, contraction or shrinkage data for any wax, oil, dye or jar, no glass thickness or internal diameter for any jar, no wick size for any jar, and no heat-survival or temperature-cycle results. There is no industry acceptance threshold for wet spots; every scale and pass line on this page is a labelled house standard. Wet-spot mechanisms are described as general candle-making knowledge. Material costs exclude labour, packaging, freight and GST. Diwali 2026 falls on Sunday 8 November.