Too hot vs too cool: two different failures, one invisible

The reason this step is the one most makers get wrong is that molten soy wax gives you no feedback. It looks the same at 75°C as it does at 95°C — clear, thin, moving. There is no colour change, no smell, no viscosity shift you can read across a ten or fifteen degree spread. So the step gets done by feel, and "by feel" in practice means "whenever I was ready", which drifts by fifteen degrees across a single afternoon of pouring. Both errors are real, both are common, and only one of them can be fixed.

A fragrance oil is not one substance. It is a blend of dozens of aroma molecules with very different volatilities, deliberately arranged so that the light ones announce the scent and the heavy ones sustain it. The light ones — citrus terpenes, green notes, delicate floral facets, the sparkle in a bergamot or a lemon — are the first to evaporate when you introduce them to wax that is hotter than the specified window. They leave through the top of the jug, in the minute or two before the wax begins to set, and they do not come back.

This is why overheating is the more damaging of the two errors. It is not recoverable. You cannot cure the brightness back into a candle, you cannot re-melt and re-dose it, and you cannot compensate with a bigger wick. What you are left with is a candle that smells like the base of the fragrance without its opening — flat, slightly muddy, and unmistakably "off" against the oil you smelled in the bottle. Makers usually diagnose this as a weak oil and change supplier, when the oil never reached the candle intact.

Adding fragrance below the specified window fails in the opposite direction and, mercifully, more visibly. Soy wax needs to be hot enough and fluid enough for the oil to go into solution. Add it below that point and the two do not fully combine — the oil remains a separate phase suspended in a wax that is already thickening around it.

You will see one or more of four things. The set wax shows streaks or marbling where the oil sat in bands. The surface sweats, developing beads or a slick oily film a day or two after the pour. The fragrance pools at the bottom of the vessel, so the top third of the candle is barely scented and the bottom is over-concentrated. And, tying all of these together, the candle reads weak when lit, because throw depends on fragrance being evenly distributed through the melt pool — a melt pool that is 3% oil at the top of the burn cannot behave like a candle dosed at 8%.

The full temperature sequence, start to set

Temperature is not one decision at one moment. It is a sequence of four controlled points — melt, addition, pour, cool — and a fault at any of them shows up in the finished candle. Here is the whole run, in order, for a scented soy container candle.

Temperature by wax, across the CSI range

Here is the honest version of the reference table you were looking for. Where CSI publishes a figure, it is stated below. Where it does not, the cell says so — because inventing a number for a wax whose manufacturer has not published one is precisely the habit this article exists to break. For every wax on this list, the pack you receive is the authority.

Two practical readings of that table. First, if you want a wax that tells you exactly what to do, CSI 464 is the most fully specified soy in the range — melt, pour and load ceiling are all stated, along with a 60-month shelf life and low frosting behaviour, which is why it is the standard choice for makers who need a repeatable single-pour container candle. Second, Eco Soy CSI 400 is the wax that states the thing this article is about: fragrance at 80–90°C, stirred for two minutes. It is a beginner-friendly one-pour chunk wax with no additives at ₹399 per 1kg or ₹1,996 per 5kg, and that instruction is printed because it is the step beginners most often skip.

For everything else — Luxury Soy Wax Chunks, Coconut Soy CSI 468, Coconut Wax, Beeswax Pellets, fully refined paraffin at ₹354 per 1kg and semi refined paraffin at ₹220 per 1kg — read the pack and, if it is not printed, ask before you pour a production batch. Coconut and coconut-soy blends are softer and set more slowly than straight soy; beeswax and paraffin behave differently again. A number carried across from a different wax is not a specification, it is a guess with a decimal point.

What a mis-timed addition actually costs you

The reason this step deserves a thermometer and a timer is arithmetic. Take a standard 200g finished candle at an 8% fragrance load: that is 16g of fragrance oil and 184g of wax. At CSI pricing, Luxury Soy Wax Chunks at ₹5,999 per 10kg work out to ₹0.60 per gram, so 184g is ₹110.20. One Eco Candle Wick Thin (C1) at ₹590 per 100 is ₹5.90. An Amber Shiny Glass Jar with Black Lid at ₹236 per pack of 5 is ₹47.20. That is ₹163.30 before a drop of fragrance goes in.

A batch of thirty sandalwood candles carries roughly ₹7,312 of materials before labour, packaging or shipping. Every fragrance oil at CSI ships in 100g, 500g and 1kg — 100g makes about six 200g candles at an 8% load, 500g makes about thirty-one, and 1kg makes about sixty-two — so a single 1kg tin represents around ₹15,000 of finished materials once wax, wick and jar are counted in. Losing that to a thermometer you did not buy is an expensive way to save ₹354.

The equipment that makes temperature controllable

Temperature control is not a skill, it is an instrument problem. Four pieces of kit turn this from a guess into a repeatable process, and the whole set costs less than one weekend's production.

Troubleshooting: symptom to temperature cause

Most candle faults that get blamed on fragrance oil are temperature faults. Find your symptom below, then change the step rather than the supplier.

Wax compatibility: what this method does and does not transfer to

Everything above is written for soy container candles, which is where CSI's published 80–90°C figures come from. The sequence itself — melt, off heat, measure, add, stir two minutes, fall to pour temperature, pour, cool slowly — transfers to every wax on the CSI range. The specific numbers do not.

Container soy is the straightforward case: Luxury Soy Wax Chunks from ₹299 per 500g up to ₹5,999 per 10kg, and CSI 464 from ₹260 per 500g up to ₹5,074 per 10kg, with load ceilings of 13% and 10% respectively. Premium Coconut Soy CSI 468 at ₹325 per 500g and Coconut Wax at ₹513 per 500g are softer and slower to set, so the cooling stage matters more and the pour window is worth confirming on the pack before a production run. Beeswax Pellets at ₹800 per 1kg carry their own natural scent and run hotter than soy. Soy Pillar Wax at ₹300 per 500g and paraffin behave differently again because they are formulated to release from a mould rather than adhere to glass.

Whatever the wax, pair it with a correctly sized wick — Eco Candle Wicks are CSI's recommendation across the soy range, Thin (C1) from ₹59 per 10 and Thick (C2) from ₹94 per 10. An undersized wick makes a perfectly dosed, perfectly poured candle read weak, which is the fault most often mistaken for a fragrance problem. Browse the full range in candle wax and fragrance oils.

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