I Bought 5,000 Replacement Wicks Before Testing Them and Now They Burn Differently — Can I Adjust the Formula or Should I Change the Wick?

First, take the 5,000 wicks off the scales

This is the hardest part of the question to hear, so it goes first. You bought 5,000 replacement wicks — your figure — before testing them, and they burn differently from your approved wick. Whatever you paid for them is spent in every option on this page. If you adjust the formula, it is spent. If you use them for another product, it is spent. If you put them in a cupboard and never use them, it is spent. So the purchase price should not decide what you do next. The decision is about future money: test costs, per-candle cost changes, wicks you would otherwise have to buy, and the risk of shipping a candle that has not been proven.

To keep the arithmetic concrete, this page uses example figures you replace with your own: the 5,000 wicks cost an example ₹5.00 each, ₹25,000.00 in total, and your approved wick is CSI's Cotton Braided Wicks Ready Made at ₹12.00 each, the same price at every pack size. So the purchase was meant to save ₹7.00 a candle — ₹35,000.00 over 5,000 candles. That hoped-for saving is the thing at stake, not the ₹25,000.00.

The three options, and what each one invalidates

Each option changes a different thing, so each voids a different set of results. This is worth seeing before any rupees, because it shows why the formula route is bigger than it looks.

Read the last row carefully. Option A creates a formula that exists because of 5,000 particular wicks. When they are used up, either you keep buying that wick — which means it has become your approved wick, and you should have qualified it properly — or you go back to the approved wick and must reverse the formula, which is another change with another round of tests. Option B has a softer version of the same question: if the owned wick qualifies in the other SKU, it may simply become that SKU's approved wick. Option C has no tail at all.

Costing the three options

The comparison below is for the next 5,000 candles of the SKU that was meant to use the wicks, and assumes each route passes its tests. Test rounds are priced with real CSI materials; labour is an example ₹2,000.00 per round that you replace with your own. The formula route assumes an example two rounds to land on a formula. Its per-candle cost depends on where the formula ends up: with Orchard Pear at ₹3.74 a gram (1 kg rate) and Chunks at ₹599.00 a kilo, one percentage point more load in a 200 g candle adds 2 g of oil and removes 2 g of wax — ₹6.28 a candle, ₹31,390.00 over 5,000 candles. One point less saves the same.

On these example numbers, both A and B spend less cash than C over the next 5,000 candles, because they use wicks you already own instead of buying ₹60,000.00 of approved wicks. That is the honest arithmetic, and it is why the formula route tempts people. But the table only counts routes that pass. If A's two rounds fail — and a formula bent around a mismatched wick is the route most likely to fail — you have spent ₹9,572.00 and are back at C. And A's running cost is not a one-off: if the formula needs one point more oil, every candle costs ₹6.28 more for as long as that formula lives.

Option B is often the quiet winner. Your wicks do not suit the 200 g jar, but that says nothing about whether they suit a different candle — a smaller container with its own approved wick, for example. If they qualify there, the tin SKU stops buying its own wicks until the 5,000 are gone: with an example 250 tins a month, that is about 20 months. The catch is time — 20 months of wick stock is working capital sitting on a shelf — and the fact that the tin SKU's formula now depends on the owned wick for as long as it lasts.

If you try option A: one formula round

A formula round tests two directions at once against the approved candle, so that one round tells you which way — if any — the formula should move. Three candles per arm and one retained control are labelled working practice.

Judge each arm on the full sheet — flame, soot, mushrooming, jar-side reading, pool, throw, consumption, end of life — against the control, and on the unlit lines too, because load changes can alter cold throw, surface and sweating. If neither direction matches the control on every safety line, stop: the formula route has failed, and a third round is rarely cheaper than option C. The hotter-jar post sets out why a stronger or hotter burn is never accepted as a trade.

Keep each round to one change. If the owned wick runs hot and you are tempted to move load and fragrance together, you will not know which did what — the one-variable post explains why. And if the owned wick behaves differently in different fragrances, the formula route becomes a range problem: the lavender-and-vanilla post shows how to screen for that, and the eight-fragrance post how to bracket a range. If the owned wick is simply a size too big or small, the size-up post describes the checks either way.

If you try option B: qualify the wick in another SKU

The worked example uses CSI's Golden Aluminium Tin, one of only two CSI containers with a published fill (85 g), as the other SKU — an 85 g candle at 8% is 6.8 g of oil and 78.2 g of wax. Its approved wick in the example is Eco Thin C1 at ₹5.90. Any product you already make with its own approved wick works the same way: the owned wick has to beat, or match, that SKU's approved wick in a side-by-side, full life.

The decision rule

Two notes on writing off. First, "write off" is an accounting decision, not a disposal instruction — the wicks can sit on a shelf while you try B later. Second, if you bought them from another supplier, ask that supplier directly about returns; do not assume either way. CSI publishes no returns terms for opened wick packs in the data this page uses, so we make no claim about ours here either.

Record the decision — including the mistake

The most useful record from this episode is not the test sheet; it is the purchasing rule it produces. Write both down.

If the pressure behind all this is a large order, the emergency 1,000-candle post sets out the minimum tests before production, and the 5,000-candle order post weighs substitution against partial production and waiting. For the money side of a cheaper wick bought on purpose rather than by accident, the ₹2-per-candle post works out the payback.

Frequently asked questions