I'm Buying Fragrance Oils in Bulk for Seasonal Candle Production — How Do I Know Whether the Finished Fragrance Remains Stable Until the Following Season?

Two different things can go stale

"Will the fragrance still be stable next season" collapses two separate holdings into one sentence. There is the oil in the bottle, unopened or part-used, sitting in a cupboard. And there is the candle on the shelf, where the same oil is dissolved in wax, in contact with glass, under a lid, in whatever light and heat your storage happens to give it. Those are not the same object and they do not carry the same exposure. Yet CSI publishes storage guidance for neither: the count of pages stating a shelf life is zero, the count stating an expiry date is zero, and the count giving any storage instruction — a temperature, a "cool dark place", an airtight bottle — is also zero.

What the pages do publish is worth separating out too, because two of the three things you might worry about are actually documented per oil. Sixty-two of the 107 pages state a vanillin or discolouration position: Eucalyptus Spearmint states "Vanillin Content 0%" and zero risk of discolouration or yellowing in light or white wax; Dark Vanilla states "Vanillin Content Present" and that it will yellow white wax over time. Eighteen pages state a measured flash point — 203°C on Sandalwood and Vanilla Bean, 199°C on Eucalyptus Spearmint, 185°C on Jasmine, 143°C on Blue Ocean. And most pages state a load ceiling and a cure time. So: colour, flash point, load and cure are published. Scent behaviour across a year is not, by anyone, for any oil in this range.

That is the honest shape of the problem, and it is also the reason this page is about structure rather than reassurance. You cannot buy certainty about next season. You can buy less exposure to it, and you can arrange for the uncertainty to be smaller next time round.

The carry decision, per 100 units

This is the arithmetic that should drive the decision, worked at 100 units so it scales in your head. Everything is 200 g candles at 8% — 184 g of wax and 16 g of oil each — in Luxury Soy Wax Chunks at the 10 kg price, a 200 ml Salsa jar at the 100-pack price and a C2 Eco wick at the 100-pack price. Note that the Salsa jar's page states a 200 ml capacity, not a weight; 200 ml is not 200 g, so weigh one filled jar before you trust a 200 g fill.

The ratio is the point. Fragrance is 35% of the materials in that candle, and it is the only one of the four lines whose long-term behaviour nobody has published. Holding it as oil concentrates your uncertainty into the cheapest, smallest, most flexible form it can take. Holding it as candles multiplies the uncertainty by the wax, the glass and the wick, and fixes every formulation choice you might otherwise want to revisit.

What buying a season ahead actually saves

The usual justification for holding oil across two seasons is the bigger pack's better price. Check the number before you accept the argument. The table compares the per-kilo price of the 500 g pack — roughly one small season's worth for many makers — against the 1 kg pack, which is the largest CSI lists.

On five of the eight, the reward for doubling the pack is between nothing and ₹40 a kilo — under two-thirds of a rupee inside a 200 g candle. Only Eucalyptus Spearmint and British Rose offer a step worth a sentence, and even ₹236 a kilo is ₹3.78 per 200 g candle at 8%. Set that against a year of holding a part-used bottle and the absence of any published guidance on how to hold it, and the arithmetic mostly says: buy the season, not the saving.

The season-to-season record

Eight units, four checkpoints, one control pair. The eight come out of the production run, not out of a special little test batch, because the thing you want to know about is the product you actually sold. Eight is a method choice: it allows two units to be opened at each of three checkpoints from the inventory arm, plus two held in a cooler place and opened only at the end. Scale it if the run is larger — sixteen out of two thousand is still under a per cent.

Oils to carry across a season

No oil can be recommended for cross-season stability on published grounds, because no page addresses it. What can be compared is everything adjacent: the stated colour position, the stated load ceiling and cure, the measured flash point where one exists, and the shape of the pack ladder — which decides whether buying the season in one bottle or two costs you anything. Each card shows every listed pack, the price per kilo at each, and how many 200 g candles at 8% the pack would pour. Where a size table shows ≈0 in its candles column, that is the 15 g trial bottle: it holds less than one 200 g candle's worth of oil at 8%, which is exactly what a trial bottle is for.

What a changed candle next season could mean

Suppose it is next October and one of your held-back units does not smell the way you remember. Several quite different things could produce that, and from outside your warehouse nobody can tell you which. The differential below pairs each candidate with the observation that separates it — and note that in several rows the separating observation is only available if you kept the control pair.

Sizing next season's order from this season's record

The output of the whole exercise is one number: how much of next season you are willing to build early. Here is how each record outcome should move it, and note that none of these outcomes is a certification of anything — they are purchasing instructions derived from your own observations.

One caution on the top row, because it is the one everybody wants. A clean record across nine months is a good reason to build more of next season early. It is not a shelf-life claim, it is not a promise to a retailer, and it does not license printing a date on the label — that needs its own programme, set out in the shelf-life guide. And regardless of what the fragrance did, some things are inspection items rather than judgement calls: cracked or chipped glass, a wick leaning on the glass, a wick that clogs or will not stay lit, a jar that becomes unsafely hot in use. Those units do not ship in any season.

Frequently asked questions