My 9 cm Candle Passes the First Three Burns but Becomes Too Hot Halfway Down — How Do I Adjust the Wick Without Causing Early-Stage Tunnelling?
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What counts as halfway? Weight, not eyesight. Tare the jar before pouring; halfway is when half the fill is left (150 g of a 300 g candle). We score a zone from 180 g to 120 g left.
Which compromise do I accept? A thin ring after burn 1 that shrinks every burn and is gone by burn 3: yes. A hotter middle to get a faster first pool: no. A flame leaning at the glass: never.
What does the test cost? Six candles, three on your current pair (2 × C2 here) and three one rung down (2 × C1), 300 g at 8%: 144 g of oil, 1,656 g of wax, twelve wicks, ₹1,561.55 of materials plus your jars. The C1 pair is ₹7.08 cheaper per candle.
Why burns 1–3 can't see the middle of the jar
Burns 1–3 test the wick against cold, full-height wax with a lot of cool glass above it. By the middle of a 9 cm jar the conditions have changed: the glass above the pool has been heated many times and now sits closer to the flames, the pool commonly runs deeper, and the flame can grow. These are common tendencies, not CSI measurements. A pair that only just reaches the edge at the top has headroom to spare there; the same pair can be more than the middle needs.
That is why a clean burn 3 proves less than it feels like. It proves the wick can reach the glass. It says nothing about what the flames do 10 or 15 hours later, which is where most of the candle's burning hours fall: in the worked example, more than three-quarters of the fill is still in the jar after burn 3. The general case of a double wick running hot near the end, and the three-arm bracket that answers it (2 × C2, 2 × C1 and a single larger wick), is the double-wick-too-hot bracket; this page owns the scorecard that reads any such bracket at two points.
Your jar, on our assumed 0.35 cm wall, is 8.3 cm inside: a 54.11 cm² pool, about 27.05 cm² per wick of a pair. At the cluster's labelled starting spacing (4.15 cm apart) the geometry is fixed for the whole test; only the wick size changes. If you suspect the flames are too close to the glass rather than too big, that is a spacing question, and the wall-gap post owns it.
The two zones and their flags
| Zone | When | What you measure | Pass | Fail |
|---|---|---|---|---|
| Zone 1: the edge | Burns 1–3 (the top of the candle) | Ring width in mm at N, E, S and W at the end of each burn; pool depth near the wall; flame | Every point 0–1 mm by the end of burn 3, and never wider than after burn 1 | Any point 2 mm or more at burn 3 that has not shrunk since burn 1 |
| Zone 2: the middle | From 180 g to 120 g of candle left (60–40% of a 300 g fill), by weight | Trimmed flame height against a ruler at 1 and 2 h; lean toward the glass; pool depth; soot on the wall; mushrooming after trim | No hard flag in any zone-2 session, and no more than one soft flag in any one session | One hard flag (flame leaning at or touching the glass, a wick drifting toward the wall) or two soft flags in one session |
| After both | Final third (100 g left) to about 1 cm | The same checks | Stays clear | Any hard flag: out |
Zone 2 is a band, not a single session, because one session can be unrepresentative: a draught, a long trim, a short burn. Four sessions in the worked example fall inside it; every one of them has to be clean. The band's edges, 60% and 40% of the fill, are our judgement; what matters is that both arms are judged across the same band, measured the same way.
| Flag | Type | How to record it |
|---|---|---|
| Flame leaning at, or touching, the glass | Hard | Photograph from the side against the jar; any lean that closes the gap to the wall. Put the candle out; its test ends |
| A wick drifting toward the wall | Hard | Measure wick-to-wall at the end of each session; a gap that keeps closing. Retire the candle |
| Trimmed flame above about 5 cm | Soft | Ruler photo at 1 and 2 h after a fresh trim; many makers use about 2.5–5 cm as a practical range (rule of thumb) |
| Pool well past about 1 cm deep | Soft | Skewer near the wall at the end of the session; the depth trend is the late-life depth chart's job |
| Soot on the wall or a dark rim band | Soft | Wipe the glass with a white cloth between sessions; any fresh band counts |
| Mushrooming back within the session after a trim | Soft | Photo of the wick head at the end of the session |
| Glass warmer session over session | Soft | Only with a non-contact thermometer (CSI lists none), same spot, same time; your own numbers, compared with each other. Never by touch |
Notice what is not on the list: a hand on the glass. Heat is judged from the flame, the pool, the soot and, if you own one, a non-contact thermometer, never by touch, and there is no glass-temperature figure that makes a candle "safe"; CSI publishes none. Jar heat as a safety question in its own right is covered in the container series; here the flags are observations you can photograph and compare.
Finding halfway with a scale
The zones only work if both arms are scored at the same point in their lives, and a smaller wick burns more slowly, so "session 8" is not the same place in a C1 candle as in a C2 candle. Weight is. Every figure below is on the candle left in the jar: gross weight minus the empty jar's tare.
Two cautions. First, the scale: CSI's Candle Making Weighing Scale page states no capacity or resolution in the text we captured, so check it handles your jar plus a 300 g candle before the test depends on it. Second, weight includes fragrance: at 8% on total weight, every gram of candle left carries its share of oil; you are measuring the candle, not the wax alone, and that is exactly what the zones are defined on.
The scorecard, candle by candle
In the worked example, the current build (2 × C2) and one rung down (2 × C1) ran three candles each, Gardenia at 8% in CSI 464, same jars, same spacing, same cure, same room, weighed after every session. The readings are illustrative, the shape of a common outcome, not CSI data:
| Arm | Zone 1 reading | Zone 2 reading | Verdict |
|---|---|---|---|
| A1–A3: 2 × Eco C2 (your current build) | 0–1 mm at burn 1; 0 at burns 2 and 3 | Every candle: flame about 5.5–6 cm and pool about 1.8 cm from session 7; soot band; A2 lean at session 9 | Fails zone 2 |
| B1–B3: 2 × Eco C1 (one rung down) | 3 mm at burn 1, 1 mm at burn 2, 0 at burn 3 in all three | Flame about 3.5–4 cm, pool about 1.1 cm; one soft flag once (B3, session 8) | Passes both |
The C2 pairs are the story in the title: flawless at the top, then a trimmed flame of about 5.5–6 cm, a pool near 1.8 cm deep and a soot band in every zone-2 session, and A2's flame leaning toward the glass at session 9, a hard flag, so A2 was put out and retired: a hard flag ends that candle's test. That is a fail, however good burns 1–3 looked. The C1 pairs pay for their calmer middle with a thin ring on burns 1 and 2, gone by burn 3 on all three candles, and one soft flag in one session on one candle, inside the pass line. They are the candidate, and the candidate then burns on through the final third to about 1 cm left before anything is approved.
Which compromise to accept
A step-down rarely passes both zones with nothing to show for it. The question is which small imperfection you will live with. Our rule, labelled as judgement: appearance at the top is negotiable if it resolves; heat in the middle is not negotiable at all.
| What you see | Verdict | Why | Condition or next step |
|---|---|---|---|
| A thin ring after burn 1 that shrinks every burn and is gone by burn 3 | Accept | Cosmetic and temporary; it tells you the first burn needs time | Care label: "burn until the pool reaches the edge"; the ring must be gone by burn 3 on all candles |
| A 1–2 mm ring still there at burn 3 but not growing, with a clean middle | Borderline | Rings that survive burn 3 commonly become a tunnel over the life | Two more burns on the same candles; if it is not gone by burn 5, treat as a fail |
| A clean top with one soft heat flag in one zone-2 session | Borderline | One reading can be a draught or a long wick | Repeat that session's conditions on the twin; a second flag = fail |
| A clean top with repeated heat flags at halfway | Refuse | Heat outranks appearance; the middle and the final third hold most of the candle's burning hours | Step down; never trade a hotter middle for a faster first pool |
| A hard flag anywhere | Refuse | A flame at the glass is a safety observation, not a trade-off | Out, whatever the top looked like |
| Neither candidate passes both zones | No compromise available | You have found the gap between two rungs | Options: the options table; CSI's range: the in-between post |
The first row is the one most makers end up in, and it comes with a job: the care label. A candle whose first burn needs time to reach the edge should say so ("burn until the melted wax reaches the edge of the jar"). The label doesn't make a bad wick good; it tells customers how to use a good one.
The step-down round, costed
Pour all six from one batch on one day. CSI 464's page states "Pour Temperature 80°C – 90°C"; your 9 cm jar is not a CSI listing, so pour at the low end and pre-warm clean jars (our judgement). Gardenia's page states a 48–72 hour cure for soy; many makers wait about a week before burn 1. Label the bases A1–A3 and B1–B3, and set every pair at the same measured spacing.
| Item | Size bought | Used | Cost of what is used |
|---|---|---|---|
| Gardenia Fragrance Oil | 100 g ₹433.00 + 50 g ₹223.02 | 144 g (24 g × 6; 6 g left) | ₹629.26 |
| Luxury Soy Wax CSI 464 | 2 × 1 kg, ₹1,014.80 | 1,656 g (344 g left) | ₹840.25 |
| Eco Candle Wicks, Thick (C2) | 10 wicks, ₹94.40 | 6 (3 pairs; 4 spare) | ₹56.64 |
| Eco Candle Wicks, Thin (C1) | 20 wicks, ₹118.00 (10-pack out of stock) | 6 (3 pairs; 14 spare) | ₹35.40 |
| Your 9 cm jars | CSI lists no 9 cm jar | 6, from the batch you measured | your cost |
| Candle Making Weighing Scale | ₹354.00 | every session, both arms | reusable |
| Round, materials consumed | 6 candles | ₹1,561.55 |
Per 300 g candle that is ₹262.84 on the C2 pair and ₹255.76 on the C1 pair (₹103.92 of oil, ₹140.04 of wax, the wicks); the step-down saves ₹7.08 a candle. Cash outlay from nothing is ₹2,237.22 with the scale or ₹1,883.22 without it. The oil is tight: 6 g is left, so a split arm that needs more candles needs another 50 g bottle. Costs are worked examples and exclude labour, freight, packaging, GST and your jars.
Time is the real cost. Sessions of 3–4 hours (the rough one-hour-per-2.5 cm rule puts a full pool near 3.3 h on an 8.3 cm pool) at one a day: in the worked example that is a week's cure, about ten sessions to clear zone 2 and four more to reach about 1 cm left, roughly three weeks from pour. Poured on 30 September, the candles clear zone 2 around 17 October and finish around 21 October.
What to buy, and what to skip
Five items for the round, chosen on page statements, price and stock on 29 September 2026. CSI publishes no wick-performance data, so nothing is ranked on burn results. Oil candles are counted at 24 g (300 g fill) and 12 g (150 g).
| Item | Price | Per unit | What it covers here |
|---|---|---|---|
| Single scale | ₹354.00 | ₹354.00 | tare, zone targets and every session weight, both arms |
| Pack | Price | Per wick | What it covers here |
|---|---|---|---|
| Thin (C1) / 10 | ₹59.00 — Out of stock | ₹5.90 | Out of stock on 29 September 2026 |
| Thin (C1) / 20 | ₹118.00 | ₹5.90 | three pairs, 14 spare |
| Thick (C2) / 10 | ₹94.40 | ₹9.44 | three control pairs, 4 spare |
| C1 or C2 / 50 · 100 | ₹295.00 · ₹590.00 / ₹472.00 · ₹944.00 | ₹5.90 / ₹9.44 | production, after full life |
| Size | Price | Per gram | 300 g candles (9 cm) at 8% | 150 g candles at 8% |
|---|---|---|---|---|
| 15 g | ₹105.02 | ₹7.00 | 0 | 1 |
| 50 g | ₹223.02 | ₹4.46 | 2 | 4 |
| 100 g | ₹433.00 | ₹4.33 | 4 | 8 |
| 500 g | ₹2,166.00 | ₹4.33 | 20 | 41 |
| 1000 g | ₹4,332.00 | ₹4.33 | 41 | 83 |
| Pack | Price | Per gram | What it covers here |
|---|---|---|---|
| 500 g | ₹260.00 | ₹0.52 | one candle |
| 1 kg | ₹507.40 | ₹0.51 | buy two: 1,656 g used, 344 g left |
| 5 kg · 10 kg | ₹2,537.00 · ₹5,074.00 | ₹0.51 | production, after the verdict |
| Item | Price | Per unit | What it covers here |
|---|---|---|---|
| Candle Wick Trimmer | ₹588.82 | ₹588.82 | trim before every session |
| Candle Wick Cutter (smaller) | ₹177.00 | ₹177.00 | the budget option; measure the length |
CandleMakingSuppliesIndia sells the wicks, scale, oil and wax named here, and does not sell finished candles. This page still tells you that the answer is often the cheaper wick, that a kitchen scale may do, that the small cutter does the trimmer's job on the bench, and that CSI has no sized wick between C1 and C2.
Every price was verified on CSI's live store on 29 September 2026. Stock was checked per size: the Eco C1 10-pack is out of stock on that date and is flagged where it appears; every other size shown is in stock. Wick, oil, load, cure, scale and temperature wording is quoted from the product pages; where a page is silent in the text we captured, we say so.
The zones, the flag list, the pass lines, the trade-off rules, the 0.35 cm wall, the 300 g fill and every scorecard reading are our judgement or worked examples; flame heights, depths and melt-pool times are commonly cited rules of thumb, not CSI data; CSI publishes no wick-performance data. For bulk pricing, GST invoicing, and MSDS and IFRA documentation on request, message us on WhatsApp at +91 7397976926.
Frequently asked questions
- My 9 cm Double-Wick Candle Has Excellent Hot Throw but the Jar Becomes Extremely Warm — Should I Reduce Both Wick Sizes?
- My 9 cm Candle Has Two Good Flames but the Melt Pool Becomes Very Deep After Three Hours — How Do I Correct It Without Losing Full-Width Melting?
- My Double Wicks Are Too Close to the Glass and the Sides Become Very Hot — How Should Wick Placement Balance Edge Melting and Container Temperature?
- I’m Testing a Wide Jar and One Wick Size Seems Slightly Too Small While the Next Is Clearly Too Large — Should I Test Another Wick Series Rather than Choosing Between the Two?
- I’m Using an 8.5 cm Jar with 8% Lavender — How Do I Decide Whether One Larger Wick or Two Smaller Wicks Is the Better Configuration?
- I’m Using an 8.5 cm Jar with Soy Wax and One Cotton Wick — The Centre Melts Well but a Thick Wax Ring Remains; Should I Wick Up or Consider Double Wicking?
- My 9 cm Jar Burns Well with Two Cotton Wicks but I Want Wooden Wicks for Appearance — Do I Need to Restart the Entire Burn-Test Sequence?
- My Multi-Wick Candle Performs Perfectly for the First Half but Becomes Extremely Hot Near the Bottom — How Can I Optimise the Wick System Across the Entire Candle Life?
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 — Black Glass Jar with Black Lid (150 gram) (Deliveries Starting 5th Dec), Black Matte Glass Jar, Complete Candle Making Course Kit for Beginners, Gardenia Fragrance Oil, Luxury Soy Wax CSI 464 (Flakes Form) For Container Candles, [1 Year Warranty] Mini Electric Wax/Soap Melter (1 litre capacity). They are general product reviews, not assessments of the wick 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 — Sraddha, Tina Lynette Lazaro Moganti, Biny Abraham, Thenirvaofficial, Tanya Walia. The reviews from M.S. are published but not recorded as verified, and carry no badge. Reviews below five stars are included as published, not filtered out.
Figures verified 29 September 2026, CSI live pricing: Candle Making Weighing Scale ₹354.00; Eco Candle Wicks Thin (C1) 10 ₹59.00 (out of stock), 20 ₹118.00, 50 ₹295.00, 100 ₹590.00; Thick (C2) 10 ₹94.40, 50 ₹472.00, 100 ₹944.00; Gardenia Fragrance Oil 15 g ₹105.02 (₹7.00/g), 50 g ₹223.02 (₹4.46/g), 100 g ₹433.00, 500 g ₹2,166.00, 1 kg ₹4,332.00 (₹4.33/g); Luxury Soy Wax CSI 464 500 g ₹260.00, 1 kg ₹507.40, 5 kg ₹2,537.00, 10 kg ₹5,074.00; Candle Wick Trimmer ₹588.82; Candle Wick Cutter ₹177.00; Performance Wooden Wicks 10 ₹590.00. Every other size listed is in stock on 29 September 2026. Per unit = price ÷ grams or units, two decimals.
Non-price figures: load is a percentage of total candle weight (300 g at 8% = 24 g oil + 276 g wax; the standard 150 g candle at 8% = 12 g). The 300 g fill, the 0.35 cm wall, the 4.15 cm spacing, the zone bands (60–40% of the fill), the flag list and pass lines, the per-session grams and every scorecard reading are worked-example assumptions or editorial judgement; CSI lists no 9 cm jar. Ceilings are as the pages state (CSI 464 up to 10%, pour 80–90°C; Gardenia up to 10% for soy, cure 48–72 hours): formulation limits, not regulatory ones. Flame height (about 2.5–5 cm), pool depth (about 0.5–1 cm) and melt-pool times (about an hour per 2.5 cm) are commonly cited rules of thumb. Costs exclude labour, freight, packaging, jars and GST. Diwali 8 November 2026 is a calendar fact.