I Use Extra Wax and Fragrance for Burn Testing Every Production Batch — Should Those Test Candles Be Included in My Cost Per Sellable Unit?

A test candle costs what a candle costs

The first decision is the size of the number, and it is larger than most sheets admit. A burn test measures how a specific wick behaves in a specific vessel with a specific wax at a specific load. Take away the vessel and you are not testing a candle; take away the wick and there is nothing to burn. So the test unit is the whole candle: ₹300.94 here, made of ₹127.40 of wax, ₹96.84 of fragrance, a ₹70.80 jar and a ₹5.90 wick.

Costing it as wax and fragrance only — ₹224.24 — is the single most common way this line goes wrong, and it is understandable, because the question in your head is about the extra wax you melted. But the extra wax went into a jar you will not sell. Across a batch of 50 with three tests, leaving the jar and wick out understates every sellable candle by ₹4.90. That is not fatal on one candle. It is the sort of quiet error that makes a maker believe a product is profitable at a price where it is not.

This page assumes three test candles a batch, and that assumption is doing real work, so it is stated rather than buried. Three is a common shape for a burn test — one to check the wick on its own, one to check the scent throw in a room, one held in reserve for the second burn or a repeat after a change — and it is not a CSI figure or a standard. If you burn two, the arithmetic here halves comfortably; if you burn six on a new format, it doubles. Put your own count in the same cell and nothing else on this page changes.

The same three candles across 50, 100 and 500

Here is the property that makes this line behave unlike wax or jars: the test does not scale. Checking that a wick drowns or that a throw fills a room takes the same three candles whether you are pouring 50 or 500 afterwards. So the testing allowance per sellable candle is ₹902.82 divided by the candles left to sell, and it falls steeply — from ₹19.21 at a batch of 50 to ₹1.82 at 500.

Read that table as an argument about batching, not about testing. The candle that costs ₹320.15 to sell at a batch of 50 costs ₹302.76 at 500, and the whole of that ₹17.39 difference is testing spread thinner. If you are pouring 50 at a time because that is what your pot holds, the fix is to pour the same recipe twice in a week and test once, not to skip the test. Testing frequency should follow risk — a new wick, a new vessel, a new load, a new season — and never batch size.

Three ways to test for less without testing less

The testing allowance has three moving parts — the number of candles, the size of each candle, and whether the vessel survives — and two of them can be changed without losing anything you actually learn. The third, the number of candles, is the one to leave alone.

The vessel row is the honest win. A burn test needs the vessel geometry, not a vessel you will never see again: burn the test in a jar of the same diameter and keep it, scrape it out afterwards and use it for the next test. That takes the allowance at a batch of 50 from ₹19.21 to ₹14.31. The half-size row is a weaker saving and a real compromise: a 100 g pour in the same jar has a different wax depth and will not tell you the truth about a full-height melt pool, so use it to compare two scents and not to size a wick. And the last row is on the table so it can be dismissed. A wick that drowns in a 220 g fill is found either by you for ₹300.94 or by a customer, for the price of the candle, the refund and the review.

Batch cost or fixed cost? The argument both ways

The case for charging tests to the batch is simple: the candles were made from this batch's materials, on this batch's day, to decide whether this batch ships. That is a variable cost by any ordinary definition, and it keeps the unit cost honest for a maker whose production is a series of small, different runs.

The case against is just as sound where the testing is development. Burning three candles to discover that a new wick suits a new vessel is a purchase of information that every future batch of that product uses. Charging it to one batch of 50 loads ₹19.21 onto those candles and nothing onto the thousand that follow, which is not a truer picture, only a more pessimistic one. Spread over a launch run of 1,000 candles the same three tests are ₹0.90 each; over a cautious first run of 200 they are ₹4.51.

Whichever bucket you choose, choose it once and write it at the top of the sheet. The failure mode is not picking the wrong bucket; it is picking a different bucket each time you cost a product, so that two of your candles carry ₹19.21 of testing, two carry ₹0.90 and three carry nothing at all, and no two prices in your range are built the same way. A costing method that is consistent and slightly wrong will serve you better than one that is occasionally perfect.

A protocol worth the money you are spending on it

The allowance on this page buys information, and how much information depends entirely on whether the burn was controlled. Most of what makes a test worth its ₹300.94 is free: writing things down, burning for a fixed time, and not changing two variables at once. This is general candle-making practice rather than anything specific to a CSI product.

One practical note on the materials in front of you. Premium Coconut Soy Wax CSI 468 is sold as a one-pour container blend, with a stated melting point of 50–53°C and a pour temperature of 58–60°C, so the working window is narrower and lower than a standard soy — which makes the pour temperature one of the variables most worth recording in a test. Japanese Cherry Blossom states the widest candle range in the CSI list at 6–13% of total wax weight, with 6–8% for a lighter floral and 10–13% for a more pronounced one. Where a wax ceiling and an oil range differ, the lower governs; here the wax states a maximum of 13% and the oil's range tops out at 13%, so the 10% costed on this page sits inside both with room above it. That range is exactly why this pairing is worth testing at two loads rather than guessing at one.

What testing costs that is not wax

The allowance costed on this page — ₹902.82 a batch, ₹19.21 a candle at 50 — is the material cost of testing and nothing else. Four other costs sit beside it, they are all real, and none of them is a CSI product, so each gets a blank row rather than an invented figure.

The time line is the one to take seriously, because it is the one that changes decisions. A candle that needs two to three weeks of cure before its throw can be judged means a new product is a month away from sale, not a week, and that is true whether you charge ₹19.21 of testing to the batch or ₹0.90 to a launch run. The material allowance is small enough that no reasonable maker should test less because of it. The calendar is the real cost of testing, and the only way to pay it cheaply is to pay it early.

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