I’m Using Three Wicks in a 12 cm Jar with 8% Oud Fragrance — Should All Three Wicks Always Be Identical Sizes?

Why symmetry argues for three identical wicks

Start with the jar, not the wick. Your title gives 12 cm; unless you measured the inside, treat that as the outside. On a 0.35 cm wall (our assumption, not a CSI figure) a 12 cm outside is 11.3 cm inside: a pool of 100.29 cm² to the glass. Measure yours at the rim, the middle and about 1 cm above the base; three wicks spread over a wide jar are sensitive to taper, because the wall moves away from every wick at once.

Now place the wicks the way the cluster does as a starting point: on a circle of radius ρ = r/2, which is 2.83 cm here, at 120° to each other. Draw the lines that split the surface by "which wick is nearest" and you get three identical 120° sectors of 33.43 cm² each. Every wick is 2.83 cm from the glass straight out, 4.89 cm from the two wall points midway between it and its neighbours, and 4.89 cm from each neighbour. (At ρ = r/2 those last two distances coincide: both are r × √3 ÷ 2 = 4.89 cm. Geometry, not a burn prediction.)

That is the whole argument for identical wicks. If each wick has the same area to melt, the same wall to reach and the same neighbours at the same distances, the only thing that can make one sector behave differently from another is the wick itself. Identical wicks remove that difference; unequal wicks put it back on purpose. In a shared melt pool, a bigger flame tends to melt its sector first and deepest, and the liquid pool tends to grow towards the hottest region, so the smaller wicks' sectors lag. Those are tendencies, not CSI data, and they are exactly what the mixed arm of the test below checks.

Notice the third row. Each of your three wicks serves about the area of a single wick in a 6.52 cm jar. That is why the three-arm test brackets C1 and C2, the rungs you would bracket for a single wick in a 6–7 cm jar, and why Cotton Braided, whose page describes it for candles "exceeding 8 cm", is not a natural arm here. Whether three wicks are the right count for your width at all is the three-wick threshold post; this page assumes you have already chosen three.

Where a mixed set can earn a test arm

There are three situations where unequal wicks are worth testing. None of them is "the oil is heavy".

1. The layout is not symmetric. An oval or rectangular vessel, a jar whose wall is visibly thicker on one side, or a design that puts one wick nearer the glass than the others: different jobs, so different wicks can make sense. A 12 cm round jar with three wicks at 120° on one circle is not this case. If your layout is uneven only because the tabs drifted, fix the tabs; the placement post owns that.

2. One wick sits in the centre. A centre wick has no wall of its own and a different job from the wicks around it; that design needs its own bracket, not this one.

3. You need a total power between two identical sets. This is the one that matters with CSI wicks. If 3 × C1 leaves a ring and 3 × C2 runs hot, the candle wants something between them, and CSI lists no sized, tabbed wick between C1 and C2. One C2 with two C1 is an obvious way to land in between on paper: by price it does (₹21.24 against ₹17.70 and ₹28.32). By pool shape, it may not, because the extra power goes into one sector instead of being shared. That is why it is a test arm and not a recommendation.

What 8% oud changes, and what it doesn't

The White Royal Oud page states "Recommended fragrance load 6-10% for candles"; Luxury Soy Wax CSI 464 states "Fragrance Load Up to 10%". At 8% of total weight you are mid-range on the oil and inside the wax ceiling even if that ceiling is read on wax weight (8% of total = 8.70% of wax). A 700 g candle at 8% is 56 g of oil and 644 g of wax; at 10% it would be 70 g of oil, at 6% 42 g.

Oud-style oils with resinous, woody bases are among those commonly linked to more carbon on the wick (mushrooming) and sometimes to a need for a different wick than a light floral, a tendency rather than a rule, and CSI has no measured wick data for this oil. The page calls it "No heavy smoke"; treat that as the page's description and let your candles confirm it. If oud does load the wicks harder, it does so in all three sectors at once, because the oil was stirred through the whole pour. A heavy oil is an argument for a different identical set, not for a mixed one.

What oud does change is how you judge the arms. Mushrooming, soot and flame height are the signals that separate "enough power" from "too much" with a heavy oil, so log them per wick, not per candle. If you suspect the hot set is spoiling the scent rather than projecting it, the blind off-note check is the oud character post, and the oil-side reason oud can flatten when burned is the oud-heat formulation post. Whether a set that smells stronger is diffusing better or just burning more wax is the throw-per-gram post.

The three-arm test: 3 × C1, 3 × C2, C2 + 2 × C1

Hold everything but the wick set: one wax bag, White Royal Oud at 8% of total weight, one jar batch measured from the inside, the same fill, the same wick circle (ρ = 2.83 cm here, or your own fixed value), the same pour temperature, cure and room. Two candles per arm is the minimum that shows an odd candle; a third candle adds up to ₹808.69 per arm before the jar. In the mixed candles, mark the C2 position on the jar (a dot of marker on the outside, level with the wick) so you can read its sector by name.

Per candle, before the jar: ₹798.07 on 3 × C1, ₹801.61 on the mixed set and ₹808.69 on 3 × C2. The wicks are the smallest line: the oil is ₹453.60 of every candle and the wax ₹326.77. Cash for the test from nothing is ₹5,582.00 (four 100 g bottles, four 1 kg bags, both wick packs and a sticker sheet). Costs are worked examples and exclude labour, freight, packaging and GST.

Reading six candles at six wall points

For each candle, after burns 1, 2 and 3, write the six end-of-session ring widths. Two numbers summarise it: the worst point (the widest ring anywhere) and the spread (widest minus narrowest). The worst point tells you whether the set has enough power; the spread tells you whether the pool is symmetric. In an identical set the spread should be small and should not sit consistently on one side; in the mixed set, the question is whether the C2 side (A) is consistently narrower than the C1 sides and their midpoint (BC).

In this worked example 3 × C1 is even but short of power (worst 5 mm, spread 2), 3 × C2 has plenty of power but runs on the hot side (flames past the common 2.5–5 cm range, carbon caps, a pool well past the common 0.5–1 cm), and the mixed set lands in between on the worst point but with a spread of 4 mm that sits on the C1 side every time. It split the difference in power and broke the symmetry to do it. The thresholds below are our judgement, chosen because they can be read off a photograph; set your own and keep them fixed.

Whatever wins burns 1–3 still needs the full life; tracking lower-third heat session by session is the cumulative-heat trend post, and how to tune a multi-wick SKU for every depth is the life-cycle spec post.

The production cost of mixing sizes

Suppose the mixed set passed everything, including the full life. Before you adopt it, put its running cost next to its saving. In wicks it saves ₹7.08 a candle against 3 × C2 (about ₹708.00 per 100 candles), and costs ₹3.54 a candle more than 3 × C1. The C2 is 44% of the mixed set's wick cost.

The break-even, worked example. At production prices a 700 g mixed candle is ₹801.77 in materials before the jar: ₹453.77 of White Royal Oud at the 1 kg price, ₹326.77 of CSI 464 and ₹21.24 of wicks. If one candle in a run has to be scrapped or replaced because a wick went in the wrong position, that one candle cancels the mixed set's saving over 3 × C2 on about 113 candles, and sooner once you add your jar, label, box and the customer's goodwill. Nobody can tell you your mix-up rate in advance; the point is that it only has to be about one in 113 for the saving to disappear.

C1 and C2 differ in thickness, so a careful single maker may never confuse them; the risk grows with a second pair of hands and a rushed festive run. If you adopt a mixed set, make the controls physical: separate labelled trays, the C2 always placed first at a mark on the jar, a last look before the pour, and a spread check in the QC burn.

How many full burns the chosen set needs across a whole fragrance range before you commit to production is the commercial test-count post. For the heavy-oil opening round in a narrower jar, see the 9 cm oud post; the logic of starting both builds from day one carries over, the jar and wick count do not.

Buying for the oud triple test

Five items, in the order you need them, chosen on page statements, price and stock on 29 September 2026. CSI publishes no wick-performance data and lists no 12 cm jar, so nothing here is ranked on burn results and your jars are not on the list. Candle counts are at 56 g of oil per 700 g candle and 12 g per standard 150 g candle.

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