My Candle Jar Is Wider at the Top Than the Bottom — How Does That Affect Burn Testing as the Candle Burns Down?

My Candle Jar Is Wider at the Top Than the Bottom — How Does That Affect Burn Testing as the Candle Burns Down?

 

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Tapered jars · test to the stop line
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Luxury Soy Wax CSI 464 (Flakes Form) For Container Candles
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"Quality is good with good fragrance"
Avanthi CheeliVerified buyer · Nov 2025
Citrus Lemon Fragrance Oil
★★★★★
"Quality wick, works very well"
AshwiniSep 2025
Eco Candle Wicks
★★★★☆
"Good quality .... if possible delivery date would be try little bit quick please"
Subhankar RoyVerified buyer · Sep 2024
Eco Candle Wicks
★★★★★
"Good product"
Biny AbrahamVerified buyer · Feb 2026
Black Glass Jar with Black Lid (150 gram) (Deliveries Starting 5th Dec)
★★★★★
"Soy wax quality is the best, which ever products ordered were properly packed and delivered as early as possible, timely response to the inquiries. Good service"
Jaya SawlaniVerified buyer · Nov 2025
Luxury Soy Wax CSI 464 (Flakes Form) For Container Candles
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"This needle is very helpful as it doesn’t damage the mould and there is no leakage of wax while pouring.. I would definitely recommend this .."
LJAug 2024
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✓ Prices verified 26 September 2026, out-of-stock items flagged ✓ MSDS and IFRA documentation on request on WhatsApp ✓ Raw materials only — CSI does not sell finished candles
CSI Jar & Container Guides · Diameter × Wick
In a jar that is wider at the top, the first burns show you the easy part. The pool shrinks as the candle burns down, reaches the glass sooner and spends longer heating, just as the flame nears the base. Here is how to test all the way to the stop line, and what to log.
72%
of the candle burned before the final third begins, in our worked tapered jar: a short test never gets there · CSI live pricing, September 2026
Quick answers — read this first
What changes as the candle burns down a jar that is wider at the top? The pool gets smaller while the wick stays the same. Each session the pool reaches the glass sooner, then spends longer deepening and warming the glass. In our worked example the pool at the stop line is 33.4% smaller than at the fill line.

So the first burns can look perfect and still hide a problem? Yes. A taper saves its problems for last. In our example, 72% of the candle has burned before the final third begins, so a test that stops after a few sessions never sees the narrow part.

How should I test it, then? A full burn-down, in 3-to-4-hour sessions, on at least two candles of your chosen wick plus one of the rung below, weighed before and after every session, with time-to-full-pool, pool depth, flame, soot and glass warmth logged each time.

When do I stop? With about 1 cm of wax left (common practice), or earlier if the final third runs hot. If it does, the lower rung may fix it; if not, the taper is the problem and the stop line or the jar has to change.
The short answer
The effect: same wick, shrinking pool. Time-to-full-pool falls session by session; the hours after full pool, when heat goes into depth and glass, grow.
The trap: the wide top holds more wax than the narrow bottom (38.9% vs 27.9% by thirds in our example), so most sessions happen where the jar is widest and the test looks easy.
The schedule: four phases (first burns, top third, middle third, final third), each with its own things to log and its own pass criteria, all the way to the stop line.
The kit: 1 kg of CSI 464, 100 g of Citrus Lemon, ten each of C1 and C2, a trimmer and a scale: ₹1,903.62; without trimmer and scale, ₹960.80.
Shop: Eco C1/C2 wicks · Candle Wick Trimmer · Weighing Scale · Candle Care Stickers Roll · Citrus Lemon Fragrance Oil
In this guide
Burning down a jar that is wider at the top Worked example drawn to scale (1 cm = 30 px): inside 6.8 cm at the fill line, 5.3 cm at the floor, 6 cm of wax, split into thirds of height. dashed: stop line, 1 cm above floor Top third · 6.8 → 6.3 cm inside 38.9% of the wax full pool about 2.7 h (rule of thumb) Middle third · 6.3 → 5.8 cm inside 33.2% of the wax full pool about 2.5 h (rule of thumb) Final third · 5.8 → 5.3 cm inside 27.9% of the wax full pool about 2.3 h, 2.2 h at the stop line (rule of thumb) Bar length = share of the candle's wax, to scale (173.37 ml in all). One 4-hour session, near the top and near the stop line (hours to scale) Session at the top melting out to the glass: about 2.7 h 1.3 h of deepening pool and warming glass Session at the stop line melting out to the glass: about 2.2 h 1.8 h of deepening pool and warming glass 0 h 1 h 2 h 3 h 4 h 72% of the candle has burned before the final third begins, so a short test never reaches it. Near the stop line the same session spends 39% longer after the pool meets the glass. Session times use the very rough one-hour-per-2.5-cm rule; log your own on every session.
A jar wider at the top, split into thirds of height and drawn to scale. The top third holds 38.9% of the wax, the final third only 27.9%, so the candle spends most of its sessions where the pool is widest and the test looks easy. In the final third the same wick meets a smaller pool, reaches the glass sooner and spends more of each session deepening the pool and warming the glass. Times use a very rough rule of thumb; log your own.
Winner plus fallback · from ₹59.00 for 10
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Straight answer
My candle jar is wider at the top than the bottom. How does that affect burn testing as the candle burns down?
It means the candle you test in the first few burns is not the candle your customer will have at the end. The wick is chosen for the wide top, where the pool is biggest. As the surface descends, the jar narrows and the same wick meets a smaller pool: 33.4% smaller at the stop line in our worked example. The pool reaches the glass earlier in each session and then spends the rest of it deepening and heating the glass, just as the flame is getting closer to the base, where heat commonly builds anyway. Because a wider top holds more wax, most sessions happen high in the jar (72% of our example candle burns before the final third starts), so short tests look fine and miss the part that matters. So test to the end: a full burn-down, in 3-to-4-hour sessions, on at least two candles of the chosen wick and one of the next rung down, weighing each candle before and after every session and logging time-to-full-pool, pool depth, flame height, soot and glass warmth. Stop with about 1 cm of wax left, and approve the wick only if the final third passes as cleanly as the first.
One line: a taper saves its problems for the final third, so the test must reach the final third.
Burn the rung below alongside the winner. Ten each of Eco C1 and C2 cost ₹153.40 (in stock on 26 September 2026): enough for two burn-down candles of the winner, one of the fallback and a retest.
Buy C1/C2 — from ₹59.00

The shrinking pool: what changes, session by session

The wick does not change between the first session and the last. Everything around it does.

This post takes the wick as chosen. How to choose it for a jar that narrows downward, against the widest pool the first burns must reach, is the selection post for narrowing jars. Here the question is what happens to that wick's performance as the candle burns down, and how to test for it.

Our worked example is a jar 6.8 cm inside at the fill line and 5.3 cm at the floor, with 6 cm of wax: about 173.37 ml, which by the 0.86-to-0.9 rule of thumb is a candle of roughly 149 to 156 g. The thirds of its height are 2 cm each. Here is how the pool changes on the way down.

The same wick, a shrinking pool · worked example, inside dimensions
Pool area at each depth, and a very rough time-to-full-pool by the one-hour-per-2.5-cm rule
Where the surface is Inside diameter Pool area vs fill line Rough time to full pool
Fill line (first burn) 6.8 cm 36.32 cm² — about 2.7 h
Top of the middle third (2 cm down) 6.3 cm 31.17 cm² 14.2% less about 2.5 h
Top of the final third (4 cm down) 5.8 cm 26.42 cm² 27.3% less about 2.3 h
Stop line (1 cm above the floor) 5.55 cm 24.19 cm² 33.4% less about 2.2 h

Three things that follow

The pool reaches the glass sooner. A smaller pool fills faster. If your first burn reached the glass at, say, hour three, expect the final-third sessions to reach it noticeably earlier. That is not a fault; it is geometry. Log it every session, because a trend that runs the other way (full pool getting slower as the jar narrows) points to a drifting wick or a memory ring, not the jar.

The rest of the session goes into depth and heat. A customer burns for a session, not until the pool is full. In a 4-hour session, the rough rule leaves about 1.3 h after full pool at the top and about 1.8 h near the stop line, 39% longer. Those are the hours when the pool deepens and the glass near the flame warms. Watch pool depth at the end of each session; a pool that was 0.5 to 1 cm at the top and is well beyond that low down is the taper talking.

The flame is closer to the base, and the base is narrower. Heat commonly builds as a candle nears the bottom of any jar: less wax to absorb it, the flame nearer the glass floor. In a jar that narrows, the walls are also closer to the flame than they were at the top. The two effects stack. This is why the final third is the part of the test that approves or rejects a tapered jar.

Mistake: running three first burns, seeing full pools and a clean flame, and approving the wick. What happens: the test only ever saw the widest part of the jar. Weeks later, a customer reaches the final third and the candle runs a deep pool with a tall, sooting flame. Fix: no wick is approved in a tapered jar until at least two candles have burned to the stop line.

Where the wax is: why short tests miss the problem

In a tapered jar, "a third of the way down" is not "a third of the candle".

Because the jar is wider at the top, the top slices hold more wax than the bottom slices of the same height. Using the volume of a tapered slice (π × height ÷ 12 × (D₁² + D₁D₂ + D₂²)), our worked example splits like this:

Share of the candle by thirds of height · worked example, 6.8 → 5.3 cm over 6 cm
More wax sits where the jar is widest
Third Inside diameter Volume Share of the wax What a test sees here
Top 6.8 → 6.3 cm 67.42 ml 38.9% Most of the sessions; the wick's easiest-looking work
Middle 6.3 → 5.8 cm 57.53 ml 33.2% Pool reaching the glass sooner; depth starts to creep
Final 5.8 → 5.3 cm 48.42 ml 27.9% Fewest sessions, most heat per cm²: the verdict

72% of the wax has gone before the final third begins. Burn rates vary with wick and oil, so we will not turn that into a session count for you; weigh your own sessions and you will know. The practical point is the same either way: a test that stops at "a few burns" covers the top third and some of the middle at best. Worse, the final third is short, so it offers only a handful of sessions to observe. Do not skip or rush them.

Use weight, not the wax line, to track progress. In a sloped jar the surface drops faster as the jar narrows, so the eye misjudges where you are. Weigh the candle before every session and divide the grams burned so far by the starting candle weight. When that passes about 72% in a jar like our example, you are in the final third. For your own jar, the water-step profile in the narrowing-jar post gives the same split.

A straight jar is the control
If you also sell a straight-sided candle with the same wax and oil, burn one down alongside the tapered one. The straight jar shows you what ordinary end-of-candle heat looks like in your recipe; any extra in the tapered jar is the taper's doing. The same idea, with a thick base in place of a taper, is in the thick-base post.

The full burn-down schedule, in four phases

A burn-down is not one test. It is four, and the last one decides.

Run this on at least two candles of your chosen wick and one of the next rung down, poured from the same batch, cured as your oil page states (the Citrus Lemon page, our costing example, says "Cure soy wax candles for 48-72 hours before burn testing"). Every session: 3 to 4 hours, still air, wick trimmed to the same length, candle weighed before and after, full cool until the wax has set before the next session, never unattended.

1
Phase A: first burns (sessions 1 and 2)The selection check. The pool must reach the glass all round within the session, about 0.5 to 1 cm deep (rules of thumb). Any ring of solid wax now means the wick is too small for the top, and the rest of the test is void: go back to selection.
2
Phase B: through the top thirdEstablish your baseline. Log time-to-full-pool, end-of-session pool depth, flame height and burn rate (g/h). These are the numbers the later phases are compared against.
3
Phase C: through the middle thirdExpect time-to-full-pool to shorten. Watch end-of-session pool depth and flame height against the baseline, and check the wick is still centred: a wick that has drifted will reach the narrowing glass on one side first.
4
Phase D: the final thirdThe verdict. Every session: pool depth, flame height, soot on the glass, burn rate and how warm the glass near the flame is compared with the same stage in a straight jar. Never handle the jar while it burns; an infrared thermometer, if you own one, gives a number, and otherwise note only what you can observe safely.
5
Stop at the stop lineEnd the last session with about 1 cm of wax left (common practice). If Phase D was clean, that is your stop line. If it was not, note the depth at which it went wrong: that becomes a candidate for a higher stop line, or the reason to change the wick or the jar.
6
Compare the fallbackPut the next-rung-down candle's Phase A and Phase D side by side with the winner's. If it filled the top and ran cooler at the bottom, it is the better wick for this jar. If it left a ring at the top, the winner stands and Phase D decides the jar.
Pass criteria by phase · rules of thumb and our judgement
The wick is approved for a tapered jar only if all four phases pass
Phase Pass Warning Fail
A · first burns Full pool to the glass in 3 to 4 h Full pool only at the very end of the session Ring of wax left: re-select
B · top third Steady flame, pool 0.5 to 1 cm, no soot Occasional flicker in a draught Soot or a tall flame this early: wick too large
C · middle third Earlier full pool; depth and flame close to baseline Depth creeping past about 1.5 cm Flame climbing and soot
D · final third Flame and depth still close to baseline; glass warmth similar to a straight jar Deep pool in the last sessions only Tall or sooting flame, very hot glass: see below

The session log: eight things to write down

If it is not in the log, it did not happen, and you cannot compare it with next month's batch.

A tapered-jar burn-down produces a trend, and trends need numbers. One line per session, per candle:

Burn-down session log · one row per session per candle
What to record and why it matters in a jar that narrows
Column How Why, in a tapered jar
1. Weight before Scale, jar and all Tracks how far through the candle you are
2. Weight after Scale, once the flame is out Grams burned; rising g/h can signal heat build
3. Session length Clock Keep it at 3 to 4 h, like a customer
4. Time to full pool Check every 30 minutes Should shorten as the jar narrows
5. Pool depth at the end A clean skewer, then measure the wet length Creeping depth is the taper's first sign
6. Flame height Against a ruler held at a safe distance behind the jar A climbing flame commonly comes before soot
7. Soot and wick Look at the glass and the wick tip Soot on narrowing glass, or a mushroomed tip
8. Glass warmth Infrared thermometer if you have one, compared with a straight jar at the same stage The final-third verdict

Keep the log with the batch record: jar name and batch, inside diameters at the fill line and near the floor, wick, wax, oil, load and cure. When a new batch of jars arrives, one short burn-down against this log tells you whether anything moved. What must match before you trust an old log for a new supplier's jar is in the switching-suppliers post.

When the final third fails

A final-third failure is information. Which information depends on whether the rung below could fill the top.

If Phase D shows a deep pool, a climbing or sooting flame, or glass much warmer than your straight-jar control, work through these in order. Each is a real option; which one is right depends on what the fallback candle showed.

Final-third failure · what to change, in order · our judgement
Change one thing, then burn down again
If Then Cost of the change
The rung below filled the top in Phase A and ran cooler in Phase D Switch to it Nothing extra; often cheaper per wick
The rung below left a ring at the top Keep the winner; raise the stop line to where Phase D was still clean, and say so on the care label Less usable candle per jar; relabel
The failure starts well above the usual stop line Fill lower, so the candle ends above the narrowest glass, or choose a straighter jar A new fill weight, or a new jar and a new bracket
Two wicks in the jar Wick spacing and trimming matter more low down See the double-wick heat post

Two warnings. Do not respond to a final-third failure by trimming harder only in the late sessions: your customer will not. And do not extend a heat claim from one jar to another. CSI's own 150 g lidded jars state a hot-pour limit ("up to 85°C"), which is a statement about pouring, not about the final third of a burn; CSI publishes no burn-down or thermal-shock data for any jar. A double-wick candle that runs hot near the end has its own post, the double-wick heat post, and why a jar can pass early burns yet crack nearer the bottom is taken up in the late-burn cracking post and the final-third testing post.

Argued against our own interest: a full burn-down of three candles takes days, and every one of those days is a day you are not ordering production. We would still rather you ran it. One final-third complaint costs more goodwill than a week of testing, and if the result is "this jar tapers too much", the cheapest time to learn it is before you buy a hundred.

What to buy for a burn-down test

Five items for running and recording a burn-down, chosen on page wording, price and stock on 26 September 2026. The wick and jar choice itself comes first; see the diameter-and-wick hub.

1
wick · the winner and one rung below it
Eco Candle Wicks — Thin (C1) and Thick (C2)
A burn-down test in a jar that narrows toward the base should carry a fallback: the next rung below your winner, burned down alongside it. If the winner runs hot in the final third, you already know whether the smaller rung can still fill the top. The page describes natural-fibre wicks that "pair perfectly with soy wax" and states no jar size. Flat per wick at every pack (₹5.90, ₹9.44). Limitation: if your winner is Cotton Braided (₹12.00 per wick), its fallback here is C2.
Pack Price Per wick What it covers
Thin (C1) / 10 Wicks ₹59.00 ₹5.90 three burn-down candles and a fallback rung
Thin (C1) / 20 Wicks ₹118.00 ₹5.90 two jar designs burned down
Thin (C1) / 50 Wicks ₹295.00 ₹5.90 50 candles once approved
Thin (C1) / 100 Wicks ₹590.00 ₹5.90 100 candles
Thin (C1) / 500 Wicks ₹2,950.00 ₹5.90 a season of one jar
Thin (C1) / 1000 Wicks ₹5,900.00 ₹5.90 bulk: confirm dispatch first
Thick (C2) / 10 Wicks ₹94.40 ₹9.44 three burn-down candles and a fallback rung
Thick (C2) / 20 Wicks ₹188.80 ₹9.44 two jar designs burned down
Thick (C2) / 50 Wicks ₹472.00 ₹9.44 50 candles once approved
Thick (C2) / 100 Wicks ₹944.00 ₹9.44 100 candles
Thick (C2) / 500 Wicks ₹4,720.00 ₹9.44 a season of one jar
Thick (C2) / 1000 Wicks ₹9,440.00 ₹9.44 bulk: confirm dispatch first
Ten of each: ₹153.40; every size in stock on 26 September 2026. Buy C1/C2 — from ₹59.00
2
tool · the same wick length every session
Candle Wick Trimmer
Across a dozen sessions, an untrimmed wick is a second variable: a longer wick means a taller flame and more heat, which is exactly what you are trying to watch for in the final third. Trim to the same length before every session (around 0.5 to 0.6 cm is a common working length, rule of thumb). The page describes stainless steel, an "ergonomic grip" and a "built-in debris catcher". Argued against our own interest: sharp nail scissors work. CSI also lists two "Candle Wick Cutter" products with the same title and near-identical descriptions: the ₹295.00 one states an 11 cm total size and a 5.5 cm blade, the ₹177.00 one 10.5 cm and a 3 cm blade. Ask us if you want to compare them.
Unit Price Per unit What it covers
Single ₹588.82 ₹588.82 every trim of every test and production candle
One trimmer serves every burn-down you will ever run. Buy the trimmer — ₹588.82
3
tool · turns sessions into data
Candle Making Weighing Scale
Weigh each candle before and after every session. Grams lost ÷ hours = burn rate; cumulative grams ÷ starting grams = how far through the candle you are. That second number tells you when you enter the final third, far more reliably than eyeballing the wax surface in a sloped jar. The page states no maximum capacity or reading step, so check the unit reads single grams. Argued against our own interest: any 1 g kitchen scale with a tare will do.
Unit Price Per unit What it covers
Single ₹354.00 ₹354.00 every before-and-after weighing in the log
The scale is what makes "final third" a number, not a guess. Buy the scale — ₹354.00
4
label · puts the stop line on the jar
Candle Care Stickers Roll
A burn-down test ends at a stop line, and so should your customer's candle. If your final-third results push you to stop with more wax left than usual, the care label is where you say so, alongside burning within sight and never leaving a candle unattended. The page describes rolls of "Candle Care Stickers" in two sizes and does not print the wording on the listing, so check what the stickers say before you rely on them for your instructions.
Pack Price Per sticker What it covers
Pack of 500 (1 inch) ₹413.00 ₹0.83 500 candles
Pack of 1000 (1.5 inch) ₹699.00 ₹0.70 1,000 candles, larger print
From ₹0.70 a sticker on the 1000 roll. Buy 500 — ₹413.00
5
oil · the costing example
Citrus Lemon Fragrance Oil
The page describes "zesty lemon and lime top notes, bright grapefruit and orange heart, and a tangy mandarin finish", states "candles (6-10%)" and says "Cure soy wax candles for 48-72 hours before burn testing". We use it to cost the burn-down because it is priced low per gram and every size is in stock on 26 September 2026; use your production oil in the real test, because the oil can move the wick. 1 kg is ₹2.83 per gram against ₹3.00 at 100 g: bulk is cheaper per gram here, but a burn-down of six candles needs only 72 g.
Size Price Per gram 150 g candles at 8%
15 gm ₹81.42 ₹5.43 1
50 gm ₹170.00 ₹3.40 4
100 gm ₹300.00 ₹3.00 8
500 gm ₹1,420.00 ₹2.84 41
1 kg ₹2,832.00 ₹2.83 83
100 g covers six burn-down candles with 28 g spare. Buy 100 g — ₹300.00
When the right purchase is nothing: if you have already poured your bracket, you probably have the candles, a scale and scissors. A burn-down test needs time, a notebook and a place to burn safely, not more shopping. Buy only if you are short of test candles or need the fallback rung.

What a burn-down costs in wax, oil and days

The materials are cheap. The days are the real cost, and they are worth it.

Worked example: six test candles, two of the winner and one of the fallback, each poured twice so you have a spare set, at 150 g and 8% (12 g oil + 138 g wax), in your own jars. Prices are CSI live pricing on 26 September 2026; costs exclude labour, freight, packaging and GST.

Burn-down kit · CSI live pricing, 26 September 2026
Six candles, fallback included: ₹1,903.62
Item Needed Buy Price
Luxury Soy Wax CSI 464 828 g (6 × 138 g) 1 kg ₹507.40
Citrus Lemon Fragrance Oil 72 g (6 × 12 g) 100 g ₹300.00
Eco C1 + Eco C2 (winner and fallback) up to 4 of one, 2 of the other 10 of each ₹153.40
Candle Wick Trimmer 1 Single ₹588.82
Candle Making Weighing Scale 1 Single ₹354.00
Total 6 candles 172 g wax and 28 g oil spare ₹1,903.62

Without the trimmer and scale (scissors and a kitchen scale work), the kit is ₹960.80; with the cheaper Candle Wick Cutter listing (₹177.00) in place of the trimmer and your own kitchen scale, ₹1,137.80. The wax and oil actually burned are worth ₹420.13 and ₹216.00. If you own everything but the fallback rung, the test costs a pack of ten wicks. At production prices, one candle's wax and oil are ₹70.02 + ₹33.98. The two Candle Wick Cutter listings differ by ₹118.00 and, on their pages, by blade size (5.5 cm against 3 cm).

Days, not rupees

Our example candle holds roughly 149 to 156 g. At a few grams an hour (measure yours), a full burn-down runs to many sessions, plus cooling between them. With two sessions a day, allow the better part of a week or more per candle, all candles burning in parallel. Add delivery and the 48-to-72-hour cure the Citrus Lemon page states, and the whole test needs roughly ten days to two weeks before you can order production with confidence.

Diwali, 8 November 2026, is 43 days after 26 September 2026. A tapered-jar burn-down needs about two weeks from pouring. Pour your test candles by 1 October, finish the final third by mid-October, and order production by 20 October. Send us your candle count and we will quote wicks, wax and oil with a GST invoice and a dispatch date from Pune.
WhatsApp a Diwali quote
The CSI principle
A tapered jar is approved at the stop line, not at the first burn.
Choose the wick at the top, then burn it all the way down, weighed and logged, with the rung below as a fallback, and let the final third decide whether the wick, the stop line or the jar has to change.
"The first burn shows you the jar's best side. The last third shows you the rest."
— CandleMakingSuppliesIndia
Why trust this guide

CandleMakingSuppliesIndia sells the wicks, tools, labels, wax and oil named here and does not sell finished candles. This page tells you that a full burn-down costs days you might prefer to spend producing, that scissors and a kitchen scale will do, that two of our cutter listings share a title and differ mainly in blade size and price, and that a strongly tapered jar may need a different jar rather than a different wick. That is deliberate.

Every price and per-unit figure was verified on CSI's live store on 26 September 2026; every pack in a pick table was in stock that day. Product wording is quoted from the pages; CSI publishes no burn-down or thermal-shock test data for any jar.

Pool areas and slice volumes are geometry on the worked example's inside dimensions, which are illustrative. Time-to-full-pool figures use the very rough one-hour-per-2.5-cm rule; the 3-to-4-hour sessions, 0.5-to-1 cm pool, 1.5 cm deep-pool warning, trim length and 1 cm stop line are rules of thumb; phase criteria are editorial judgement. For bulk pricing, GST invoicing, and MSDS and IFRA documentation on request, message us on WhatsApp at +91 7397976926.

Frequently asked questions

Why does my candle burn well at first but get hotter near the bottom of a tapered jar?
The wick is sized for the wide top, and the pool shrinks as the jar narrows: 33.4% less area at the stop line in our worked example. The pool fills sooner, then spends longer deepening and warming the glass, while the flame nears the base. Test to the stop line to see it.
How many burns does a candle burn test need?
For a tapered jar, a full burn-down to about 1 cm of wax left, in 3-to-4-hour sessions, on at least two candles of the chosen wick plus one of the rung below. In our example 72% of the wax burns before the final third starts, so a few burns never reach it.
How do I know when my candle has reached the final third?
Weigh it. Divide the grams burned so far by the starting candle weight; in a jar like our worked example the final third starts at about 72%. The wax line misleads in a sloped jar, because the surface drops faster as the jar narrows.
What should I record during a candle burn-down test?
Per session and candle: weight before and after, session length, time to full pool, pool depth at the end, flame height, soot and wick condition, and glass warmth compared with a straight jar at the same stage.
What do I do if the last third of my candle burns too hot?
Try the rung below if it still filled the top; if it did not, raise the stop line to where the burn was still clean and say so on the care label, fill lower, or choose a straighter jar. Change one thing, then burn down again.
Should I stop burning a candle with wax left in the jar?
Yes. Stopping with about 1 cm of wax left is common practice, and a tapered jar may need a higher stop line if its final third runs hot. Burn within sight, keep the wick trimmed and never leave a candle unattended.
Your tapered jar, tested to the end
Wax, oil, winner and fallback wicks, trimmer and scale: ₹1,903.62.
Burn two candles of your chosen wick and one of the rung below all the way to the stop line, weighed and logged every session. You will know whether the wick holds in the narrow part of the jar before your customers find out.
Start with C1 and C2 Order the burn-down kit on WhatsApp
Continue the read — jar diameter and wick selection
Editorial standards & sources
About this guide: how a jar that is wider at the top changes burn testing as the candle burns down: the shrinking pool session by session, where the wax sits by thirds and why short tests miss the final third, a four-phase burn-down schedule with pass criteria, an eight-column session log, what to change when the final third fails, and a costed burn-down kit.

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), Citrus Lemon Fragrance Oil, Eco Candle Wicks, Luxury Soy Wax CSI 464 (Flakes Form) For Container Candles, Premium Candle Wicking Needle. They are general product reviews, not assessments of the container 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 — Avanthi Cheeli, Subhankar Roy, Biny Abraham, Jaya Sawlani. The reviews from Ashwini, LJ 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: Eco Candle Wicks Thin (C1) 10 ₹59.00, 20 ₹118.00, 50 ₹295.00, 100 ₹590.00, 500 ₹2,950.00, 1000 ₹5,900.00 (₹5.90 per wick); Thick (C2) 10 ₹94.40, 20 ₹188.80, 50 ₹472.00, 100 ₹944.00, 500 ₹4,720.00, 1000 ₹9,440.00 (₹9.44 per wick); Cotton Braided Wicks Ready Made (₹12.00 per wick); Candle Wick Trimmer ₹588.82; Candle Wick Cutter listings ₹295.00 and ₹177.00; Candle Making Weighing Scale ₹354.00; Candle Care Stickers Roll 500 ₹413.00, 1000 ₹699.00; Luxury Soy Wax CSI 464 1 kg ₹507.40, 10 kg ₹5,074.00; Citrus Lemon Fragrance Oil 15 g ₹81.42, 50 g ₹170.00, 100 g ₹300.00, 500 g ₹1,420.00, 1 kg ₹2,832.00. Per unit = pack price ÷ units; per gram = price ÷ grams; two decimals.

Non-price figures: the jar (6.8 cm inside at the fill line, 5.3 cm at the floor, 6 cm of wax) is a worked example; pool area = π × r²; slice volume = π × h ÷ 12 × (D₁² + D₁D₂ + D₂²); 1 g of water ≈ 1 cm³ and the 0.86-to-0.9 wax factor is a rule of thumb. Time-to-full-pool uses the very rough one-hour-per-2.5-cm rule. Pool-depth, trim-length, session-length and 1 cm stop-line figures are rules of thumb; phase criteria are judgement. Test candles are 150 g at 8% (12 g oil + 138 g wax). The 85°C figure is page wording for pouring. Diwali is a calendar date; the schedule is a worked plan, not a delivery promise. Costs exclude labour, freight, packaging and GST.
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