I Changed from Pure Soy to a Soy-Coconut Blend — Which Parts of My Existing Candle Formula Should Automatically Be Considered Unvalidated?

What "automatically unvalidated" actually means

Makers usually ask this question after the first coconut-soy candle looks good, and the temptation is to assume the old formula has survived. It has not, and not because anything is known to be wrong. It is because several lines on the card were only ever justified by the wax. The 10% load was acceptable because the old wax's maker rated it up to 13%. The wick was chosen for that wax's melt pool. The pour temperature came from that wax's instructions. Each of those lines now points at a material you no longer use. They are not failed; they are unsupported. That is what "automatically unvalidated" means in change control, and it is different from "needs a quick look".

There are three categories, and the diagram above stamps each line of a real formula card with one of them. Void by definition (NEW): anything whose justification was a property of the old wax — the load ceiling, the temperatures, and any marketing claim about the wax itself. Untested (REPEAT or CONFIRM): anything the wax can influence in the finished candle — wick, throw, cure, appearance, heat stability. Still valid (KEEP): anything that describes an unchanged component on its own — the oil's documents, the jar, the label artwork. A useful way to sort a line is to ask: if I had never used the old wax, would this line still be true? If not, it goes.

The load line: why 10% is now an open question

This is the line most makers miss. In the example, the approved formula is a 200 g candle at 10% — 20 g of Mango Coconut and 180 g of wax. In Luxury Soy Wax Chunks that load sits inside the 13% its wax maker states, so the question "is 10% allowed?" was answered by the supplier. For Premium Coconut Soy Wax CSI 468 no fragrance ceiling is quoted in this series. That does not mean 10% is too much. It means you do not yet know, and a formula whose load is not supported by the wax maker is not a releasable formula.

So the load goes on the list as NEW, and it is resolved in two ways at once. First, ask: message CSI on WhatsApp for the wax maker's stated maximum for CSI 468, or check its product page. Second, test: run the new wax at your old load and one step lower, so that if the stated maximum turns out to be below 10%, you already have data at 8%. The same logic applies to Coconut Wax and Premium Coconut Soy Wax — neither has a ceiling quoted in this series.

The test plan, one variable at a time

Because the old wax is still available, this change has a luxury the discontinued-wax case does not: you can pour a fresh control the same day, in the same jar, from the same bottle of oil. Use it. The protocol below is a working practice, not a standard — three candles per variant, 3–4 hour burn cycles with full cool-down, cure checkpoints at 48 hours, 7 days and 14 days as labelled examples. The wick options are your current approved wick (Wick A — Cotton Braided Ready Made in this example) and one alternative (Wick B — Eco Thin C1). CSI publishes no wick size per jar diameter and no claim that one CSI wick equals another; the burn decides.

That is 12 candles: 3 controls, 6 in stage 1 and 3 in stage 2. Nothing is varied at the same time as the wick, which is why stage 2 waits. If you run several fragrances in the same wax, do not multiply this by every fragrance — the range-requalification post explains how to anchor the riskiest ones and confirm the rest.

Scoring sheet: coconut-soy against the soy control

Score each candle beside its control, same room, same session. The lines that decide pass or fail are the safety lines — flame height, soot, mushrooming and jar heat must be no worse than control and within your jar supplier's guidance and the fire-safety standard you work to (ASTM F2417 is a commonly cited US one). CSI publishes no numeric limit for these, so the control is your yardstick.

The priced test kit and the cost per candle

The kit uses listed, in-stock CSI sizes, with oil per candle on the CSI convention (load = share of the finished candle): 20 g of oil and 180 g of wax at 10%, 16 g and 184 g at 8%, plus a 5% pour-loss allowance (a working assumption). The jar here is the 200 ml Salsa Glass Jar with golden lug cap — its fill weight is not published, so weigh one test pour to confirm it holds 200 g at your fill line before pouring the rest.

Then do the arithmetic the switch changes permanently. At 10%, each 200 g candle holds 180 g of wax. In Chunks at ₹599.00 a kilo that is ₹107.82 of wax; in CSI 468 at ₹650.00 it is ₹117.00 — ₹9.18 more per candle. The pure coconut and premium coconut-soy options cost more again: ₹184.79 in Coconut Wax and ₹165.60 in Premium Coconut Soy Wax. If stage 2 shows the blend holds its throw at 8%, the fragrance line falls from ₹79.28 to ₹63.42 at Mango Coconut's 1 kg rate while the wax line rises by 4 g — the total-economics post shows how to compare those two moves properly.

Decision rule, release and the new card

The new formula is approved only when every NEW line has an answer and every REPEAT line has a result. That means: a stated maximum from the wax maker that covers your chosen load; temperatures taken from CSI 468's instructions; a wick with every safety line no worse than the soy control; throw within one blind point at the cure checkpoints; acceptable tops and adhesion; no sweating in warm storage; and at least one candle burnt to the end. If the wick fails and the load is fine, re-run the wick with the next alternative. If the stated maximum is below your load, the formula is reformulated before anything else is tested. If both wicks fail, stop — the blend may not suit this candle, which is a legitimate result.

Write the new card as a new version, not an edit. Keep the soy version on file with its approval date, so anyone later can see what changed and why. Record the wax name and order date, the load and its source (the wax maker's figure), the temperatures and their source, the wick, the test-candle numbers and the sign-off. Then change the label wording. A candle made in a coconut-soy wax should not be described as pure soy, and that wording is part of the product just as much as the wick. The replacement-documentation post shows how to file the change, and the master checklist lists every item for any wax change.

Where soy-to-blend switches go wrong

The most common error is changing the jar, the oil or the wick at the same time as the wax because "we're retesting anyway". Then a candle fails and nobody knows which change caused it. The one-variable-at-a-time post explains why that rule matters most exactly when you are busiest. The second error is treating the old temperatures as defaults. They were the old wax's instructions; the new wax has its own, and a blend poured to someone else's numbers can give tops and adhesion that have nothing to do with the wax's real behaviour.

The third is relying on the first burn. A blend that reaches a full melt pool pleasingly on burn one still has to prove itself in the last third, where heat builds and the wick's margin shows. The fourth is forgetting the label. If your product page, box or label says "100% soy", the switch has made that sentence untrue, and it is the cheapest line on the whole card to fix. Finally, if the switch was meant to improve summer stability rather than looks, test for that directly — the harder-wax post covers heat-stability testing when that is the goal, and the summer-sweating post covers sweating after a wax change.

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