My 6 cm Soy Candle Reaches a Full Melt Pool Within One Hour but the Flame Looks Unusually Large — Does That Mean the Wick Is Oversized?

Why a one-hour pool is a question, not a verdict

A fast pool is the most visible over-wick symptom, and in a small jar it is often right. But the pool only reports the total heat reaching the wax, and several things other than the wick add heat or cut the wax you have to melt. That is why the scorecard makes speed Signal 1 and never lets it decide alone.

Start with the arithmetic. A very rough rule of thumb, widely repeated among candle makers and not CSI data, is about one hour of burning per 2.5 cm of jar width. On the listed 6 cm that is about 2.4 hours; on a 5.3 cm inside, which is what a 6 cm outside leaves on our 0.35 cm wall assumption, about 2.1 hours. One hour is 47% of the second figure. A pool at 50 minutes, the worked example in the diagram, is 39%. So yes, "within one hour" is fast for this jar, roughly twice the rule-of-thumb pace. The question is why.

The common non-wick reasons, each a tendency rather than a rule: a warm start (a candle relit before the wax has fully cooled starts part-melted; a hot afternoon in April–June warms the whole jar); a shallow pour (less wax above the base means less to melt, and a pool that "arrives" sooner in a jar filled to 3 cm than in one filled to 5 cm); air movement (a ceiling fan or AC vent makes the flame lean and flicker, heating one side fast); a light oil (lighter herbals and citrus often burn more easily than dense gourmands, so a wick chosen for a vanilla can run fast with a eucalyptus); and the second burn, which commonly pools faster than the first. The full confounder protocol, for 8 cm, is the speed-with-no-soot post.

And now the reason not to shrug a fast pool off: this is a small, short jar. CSI's 6 cm Black Shiny Glass Jar with Golden Lid is listed as 6.5 cm tall. The final third, where heat commonly builds as the glass above the pool warms, arrives within a few sessions. A wick that is fast and tall at the top of a 6.5 cm jar is exactly the kind that commonly misbehaves near the bottom, which is where the flame-gets-larger-as-the-wax-falls post picks up. So you take the question seriously, and you answer it with more than one signal.

The three-signal scorecard

Burn the candle and, if you have one, a twin from the same pour: still air, a level surface, a normal room, a full cool-down since the last burn. Trim both wicks to about 1/4 inch first. The thresholds are our judgement, chosen because each can be read without touching anything hot; set your own if you prefer, then keep them fixed.

Reading a flame you must not touch

Signal 2 is where it is easiest to go wrong, because a flame is hard to judge by eye and easy to change by accident. Three habits make it a measurement.

Trim first, the same way every time

An untrimmed wick carries more fuel to the flame and burns taller whatever its size. So the scorecard only reads a trimmed flame. One CSI trimmer page says "Trim your wick to 1/4 inch before every burn", which is 6.35 mm; many makers work to about 5–6 mm. Pick one and keep it. Trim when the wax is cool, and remove the trimmed end from the jar: debris in the pool adds a second, unintended flame source. If your flame is only tall when the wick is left long, that is a trim-discipline question for the customer's label; how tolerant a wick is to a skipped trim is the untrimmed-tolerance test, a different post.

Measure against something that isn't the jar

Hold a steel ruler upright behind the candle, a hand's width back, and read where the flame tip meets it with your eye level with the tip. Measure from the wax surface, not from the rim. Never touch the glass or put anything against a lit jar to judge its temperature: CSI lists no non-contact thermometer, and in this post heat is judged by what you can see, the flame's height and position and the glass's colour, not by feel.

Read it three times, and read it in still air

A flame is not a fixed number. It commonly settles after a few minutes and dances in any draught. Three readings, at 30 minutes, 1 hour and 2 hours, show whether "big" is a moment or a state. A single tall reading next to an open window is weather. Two readings above about 5 cm in still air are a flag.

In the diagram's worked example the flame reads about 6.5 cm from a wax surface about 1 cm below the rim, so it stands about 5.5 cm above the jar. That looks dramatic at the top of the candle. The real concern is lower down: when the wax is within a centimetre or two of the base, the same flame burns inside the glass, 26.5 mm from the wall on a centred wick. The jar-gets-very-hot-on-the-final-burn post covers how to read that final burn safely; the scorecard's job is to catch the wick before you get there.

Reading the card: five outcomes

Score both candles, then find your row. The rows are our judgement, labelled as such; the principle underneath is that a fast pool alone is never enough to change a wick, because too many things that aren't the wick make pools fast.

There is no row where a fast pool alone sends you shopping, and none that says "use less fragrance". The oil can contribute (light oils often burn more easily, heavy ones commonly mushroom), but cutting the load to fix a fast pool is the wrong direction for most oils and changes the product. If a heavy oil is involved and mushrooming is the main flag, the question changes shape: the 6.5 cm vanilla post swaps the oil before the wick. For wick symptoms that come from the oil rather than the wick size, see also whether heavy fragrance oils need a larger wick.

Already on C1: the bottom of CSI's range

CSI's tabbed, sized rungs are short: Eco Candle Wicks in Thin (C1) and Thick (C2), then Cotton Braided Wicks Ready Made, whose page describes it for "large-diameter candles exceeding 8 cm". There is no sized, tabbed wick between C1 and C2, and no smaller sized, tabbed wick than C1. So the step-down depends entirely on where you start.

If you are on C2, one rung down is C1, and that is the test: current wick against C1, three candles each. The detail of a C2 → C1 step-down in the next jar up is the 7 cm step-down post; at 6 cm the method is the same and cheaper.

If you are on Cotton Braided or a wooden wick in a 6 cm jar, you are well above what those pages describe (Cotton Braided "exceeding 8 cm"; Performance Wooden Wicks are one listing with no widths to step between). Step to C2 or C1 and score again.

If you are already on C1 and the scorecard still flags, you are at the floor of CSI's tabbed range, and we would rather say so than sell you something that does not exist. You have four honest options:

The Loose wick deserves a careful word, because it is the answer the angle of this post turns on. Its page figure, 2 inches, is 5.08 cm, a pool of 20.27 cm². That sits close to a 5.3 cm inside (22.06 cm², 9% more), which is what a 6 cm outside leaves on a 0.35 cm wall. It sits further from a true 6 cm inside (40% more). So on paper it is described for a jar a little narrower than yours. On paper is all we have: the page does not say the wick is thinner than C1, how it is braided, whether it is primed, or how it should be anchored. It is sold by length and, in the text we captured, untabbed. CSI lists no stand-alone wick tabs; the Braided Wick Roll (₹706.82) comes with 100 tabs, but it is a different, unsized wick. Ask us on WhatsApp how to anchor the Loose wick before you pour, and label it as an arm of its own.

The step-down test at 6 cm, costed

Once the scorecard shows two flags on two candles, run the step-down. Same wax bag, same oil and load on total weight, same jar batch, same fill, pour temperature, cure and room. Two cells: your current wick (the control) and one rung down, three candles each. Our worked example uses CSI's 6 cm Black Shiny Glass Jar with Golden Lid ("Capacity: 120 gm"), a 100 g fill at 8% (8 g of Eucalyptus Spearmint + 92 g of CSI 464), and the case that matters most here: C1 as the control, the Loose 2-inch wick as the arm.

If you are on C2 and the arm is C1, swap the Loose line for three C2s from your own stock: the same six candles cost ₹779.22 in materials. From nothing, the C1 v Loose kit is a cash outlay of ₹1,675.60; if you own the wax, oil and jars, it is ₹531.00 for the two wicks. A C1 candle in this example costs ₹128.10 in materials. All costs are worked examples and exclude labour, freight, packaging and GST. Two confirmation twins on your current wick, if you have none, add ₹244.40 of oil, wax and jars.

How to read the step-down

Score every candle on the same three signals, over at least two sessions, then carry the candidate to full life (to about 1 cm left). "Passes" means at least two of three candles clear Signals 2 and 3 and reach the glass by burn 2 or 3.

Whether two cells are enough to call a wick "chosen" is the adjacent-sizes post's question. At 6 cm it is also a question about CSI's range: if C1 is your control and the Loose arm fails, "nothing smaller" rests on what we list, not on proof about your candle.

What to buy, and what to skip

Four items, chosen on page statements, price and stock on 29 September 2026. CSI publishes no wick-performance data, so nothing is ranked on burn results.

Frequently asked questions