I Want to Hold Candle Inventory for Six Months — Should I Test Fragrance Performance After Storage Before Ordering Several Kilograms of That Fragrance?

Why you cannot buy six-month data today

The question in the title is the right question, asked at the wrong moment. If you are planning to hold finished candles for six months, you would obviously prefer to know how the fragrance behaves over six months before you buy several kilograms of it. But a six-month observation requires six months of elapsed time, and there is no legitimate arithmetic that converts a hot cupboard into a calendar. Warm storage is a screening tool — it can surface a problem early — but it does not translate into a number of months at ambient temperature, and anybody who offers you that conversion is inventing it.

It is worth being precise about what is and is not published, because that is what your planning has to rest on. Across the 107 fragrance-oil product pages in CSI's range, the number that state a shelf life is zero. The number that state an expiry or best-before date is zero. The number that give a storage instruction — cool, dark, airtight, any temperature at all — is zero. What the pages do publish, on 62 of 107, is a vanillin or discolouration position: Sandalwood states "Vanillin content 0%" and that it will not cause discolouration or yellowing in white or light-coloured wax; Dark Vanilla states "Vanillin Content Present" and that it will yellow white wax over time. So colour behaviour over time is documented per oil. Scent behaviour over time is not documented anywhere, by anyone, in this range.

That asymmetry is the most useful thing on this page. It means a fragrance's colour risk can be read off the product page before you buy, and its scent-over-time behaviour can only come from your own stored units. Two different risks, two different sources of evidence, and only one of them is free.

What staging costs, per kilogram

On CSI's fragrance oils the listed price per kilogram generally falls as the pack gets bigger, so buying a 100 g test pack before the kilo is not free. It is, however, cheap — and on two of the eight oils below it costs nothing whatsoever. The table sets out the arithmetic: the 100 g pack price, what that works out to per kilo, the 1 kg pack price, and the gap. That gap is the entire financial cost of insisting on your own evidence.

Read the last column before you argue with the fifth. Even the widest premium in CSI's range works out at ₹7.55 of extra fragrance inside a 200 g candle — ₹755.20 across a hundred candles, on a batch whose materials come to ₹22,975.04. Against that you are protecting the value of every unit you are about to hold for half a year. The premium is not a reason to stage; the premium is the proof that staging is nearly free.

The three-tranche purchase ladder

Here is the structure in units and rupees, for a maker planning to build and hold 300 candles of 200 g at 8% — 4.8 kg of oil in total. Sandalwood is used as the worked example because its listed price per kilo is flat from 100 g upward, which makes the arithmetic clean; substitute your own oil and only the rupee column changes.

Notice what the ladder does and does not buy you. It does not make the fragrance more stable. It does not give you month-six data in week eight. What it does is move ₹16,085.76 of commitment — tranches 2 and 3 — from a day when you knew nothing to days when you knew something. If the month-two checkpoint shows the warm-arm candles have yellowed while the control has not, you have spent ₹8,545.56 finding out instead of ₹24,631.32.

The parallel ageing trial, costed

Twelve candles, three arms, four checkpoints. The number twelve is a method choice, not an industry standard: it is the smallest count that gives you two units to open at each of three checkpoints in each of two stored arms, plus a pair of cooler controls held back to the end. If you can spare eighteen, run six per arm and you will be able to repeat a surprising result instead of arguing about it.

Against a 300-unit hold worth ₹68,925.12 in materials at ₹229.75 per 200 g Sandalwood candle, a trial that consumes ₹1,253.88 is 1.8% of the inventory at risk. Add a weighing scale at ₹354 and a pen thermometer at ₹354 if you do not already own them; both are bought once and used on every batch afterwards.

Which oils to stage — and which to simply buy

Staging is a response to uncertainty, and the uncertainty is not identical across oils. Where the product page already tells you the colour outcome, one of your two risks is documented before you spend anything, and the trial only has to watch scent and surface. Where the page tells you the oil contains vanillin and will yellow light wax over time, you are not testing whether it happens — you are deciding whether your customer will accept it, which is a commercial judgement, not a chemistry one. Each card shows the full pack ladder, the price per kilo at each pack, and how many 70 g test candles the pack would pour at 8%.

A note on the size tables above: the 15 g row shows how few 70 g test candles a trial bottle would pour, and at 200 g it would not complete one candle at 8%. That is not a criticism of the 15 g pack — it exists so you can smell an oil before you commit to it, and it does that job well. It is simply the wrong pack for a trial whose whole purpose is to leave units standing in a warehouse for three months.

What the aged sample can and cannot tell you

Before the kilos are committed, be clear about what each observation licenses. The table below is the differential: what you might see, what could be behind it, and what separates the candidates. Every row has more than one plausible cause, and from a distance nobody can tell you which one applies to your batch — that is exactly why the control arm exists.

The decision at week twelve

At the last checkpoint you have four things: a weight log across three arms, a set of photographs, a blind paired comparison, and one burned unit from each of the stored and control arms. Here is how to turn them into a purchase instruction rather than a feeling.

One more piece of arithmetic worth having in front of you when you make that call. At ₹229.75 of materials per 200 g Sandalwood candle — ₹110.38 of wax, ₹80.43 of oil, ₹29.50 of jar and ₹9.44 of wick — the 300 units in this plan represent ₹68,925.12 before any labour or packaging. Fragrance is 35% of that. It is the single largest line after the wax, and it is the only line whose behaviour over six months nobody has published. If you are going to spend three months watching something, watch that. For the wider costing frame, see how to price candles in India 2026.

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