My Candle Flame Became Larger After I Reduced Fragrance Load — Could Changing the Formulation Alter Wick Behaviour in Either Direction?

Why a load change moves the wick, in either direction

Your symptom, restated: the same jar, wax and wick; the only deliberate change was a lower fragrance load; and the flame is now larger than it was. You haven't said why you cut the load. The usual reasons are cost, sweating, a scent that was too strong, or soot. If it was soot at the higher load, that problem has its own post, soot after raising the load; this one is about the flame that grew when the load came down.

In the worked example the old candle was 200 g at 9%: 18 g oil + 182 g wax. At 7% it is 14 g oil + 186 g wax. That is 22.2% less oil and 2.2% more wax per candle. The wick sees a different fuel. Three common observations explain why that can change the flame, and all three are tendencies:

Damping. Many fragrance oils burn less readily than wax alone, so a pool rich in oil can give a slightly smaller, sometimes sootier flame. Less oil, less damping. Clogging and carbon. Heavier oils can slow the fuel moving up the wick or leave carbon on the tip; at a lower load the wick may run cleaner and draw harder. Wick choice at the old load. If your C2 was picked because a smaller wick struggled with a heavy load, the reason for that choice has partly gone. On the other side, some oils have lighter components that burn readily, and with those a lower load can shrink the flame. That is why "either direction" is the honest answer, and why only a re-test settles it.

Load is its own discipline: why less oil sometimes performs better overall is reducing the load from 10% to 8%, and when a full pool and deep melt at a high load raise the question of load or wick first, see 10% rose and a deep pool. When the same oil is used at a different load for cost reasons, the wick question is the one in an expensive fragrance at only 6%. If the oil itself changed too, read the lavender-versus-vanilla post first.

Was it the load? The causes, ranked

The ranking is our judgement, ordered so the free checks come first. B = how the candle was burned (user behaviour); F = how it was made (formulation and process).

Cause 4 deserves a moment. A load is grams of oil over grams of finished candle. "I added a bit less" and "I went from 50 ml to 40 ml" are not loads. If you used to calculate on the wax weight and now calculate on the total, your load moved even though the number on your sheet did not: 9% of the total is 9.89% of the wax. If cause 5 is possible, the lot comparison method is in comparing lots before changing the formula.

The four-arm re-test: old, now, rung down, middle

The worked example, labelled: your own jar, 200 g candles, Luxury Soy Wax CSI 464, Jasmine Fragrance Oil, current wick C2. Old load 9% (18 + 182 g), new load 7% (14 + 186 g), middle load 8% (16 + 184 g), all on a total-weight basis. If your current wick is Cotton Braided, the rung down is C2. If it is already C1, there is no smaller tabbed CSI wick, which makes arm D (a middle load) the main alternative.

The saving you were after, and when it is real

If the load came down to save money, here is what it is worth in the worked example. Jasmine at its 1 kg price (₹3,923.00 a kilo, worked to the gram): 9% is ₹70.61 of oil per 200 g candle; 7% is ₹54.92. The saving is ₹15.69 a candle, or ₹3,138.40 a month at 200 candles. Moving from C2 to C1 would save another ₹3.54 a candle. The middle load (8%) saves ₹7.85 a candle, ₹1,569.20 a month, and might keep the wick you have.

Argued against our own interest: if only arm A passes, the honest answer is to go back to 9% and keep the wick. You will buy more oil from someone, possibly us, but a candle that burns correctly is worth more than ₹15.69 a candle. And if C and D both pass, D is the one that needs no new wicks at all. For load decisions beyond this one candle, the load posts linked above are the place; for re-testing the rest of a collection after one formula changes, see not re-testing every fragrance.

The CSI buy list and the production step

CSI's sized, tabbed wicks are three rungs, C1 → C2 → Cotton Braided. There is no sized, tabbed wick between C1 and C2, nothing smaller than C1, and one wooden width. That matters here: if 7% runs big on C2 and tunnels on C1, the step you need may not be on our shelf. Arm D exists for that reason: a middle load can be a finer adjustment than any wick we sell. If you would rather keep 7% and need something between C1 and C2, ask us on WhatsApp, and we will say plainly if we don't stock it.

The step to production quantity

When an arm passes, production follows the new formula: oil = candles × fill × load, wicks = candles × wicks per candle × (1 + a defect allowance). Worked example, labelled: 200 candles a month. At 7% you need 2.80 kg of oil a month instead of 3.60 kg at 9%. If C passed, 204 C1 wicks with a 2% allowance: 2 × 100 + 20 = 220 for ₹1,298.00 (16 spare); because C1 is the same ₹5.90 a wick at every pack, a bigger pack only ties up cash. If D passed, keep buying C2 as before. Write the new load and wick into the formula sheet together, with the date, so the next batch can't pair 7% oil with the old wick by habit. CSI publishes no lead times; confirm yours on WhatsApp before you set a reorder point.

Four items for the re-test, and what to skip

Four items, chosen on page statements, price and stock on 7 October 2026. CSI publishes no burn, soot or wick data for any oil, wax or wick, so nothing here is ranked on performance, and each card says when not to buy.

Skip for now: Cotton Braided (the wrong direction for a flame that grew); a 500 g or 1 kg of oil before you know which load you'll keep; and any 500- or 1,000-wick pack before an arm passes the bottom third. If the lower load also changed mushrooming, that comparison is mushrooming at 10% versus 7%.

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