My Candle Brand Has 12 Fragrances — How Do I Prioritise Which Formulas Need the Most Intensive Shelf-Life Testing?

Why equal testing is the wrong kind of fair

With twelve scents, a thorough real-time test of each — several candles at several checkpoints, fresh references, burn pairs — can run to well over a hundred candles and months of assessment sessions. Most small brands respond in one of two ways. They test everything lightly, which means the scents most likely to fade get the same single candle as the ones least likely to. Or they test only the two they personally worry about, which leaves the rest to luck.

A scoring matrix is a third way. It is not clever; it simply forces you to write down why one fragrance deserves more attention than another, so that your test budget follows risk and consequence instead of habit. It also gives you something to revisit when a supplier lot changes or a complaint arrives.

One caution before the numbers. Every score below is a planning judgement. Nothing here, and nothing on CSI’s product pages, tells you how long any oil lasts in your candle. CSI oil pages publish no shelf life or storage data. The matrix only decides the order of the questions.

The four factors and how to score them

Add the four. Totals run from 4 to 12. As a suggested starting point, 9 or more is tier A, 7–8 tier B and 6 or below tier C. Keep a separate flag for colour: vanillin-containing oils such as Dark Vanilla can yellow or warm wax colour over time, according to their own pages, so they need colour checks whatever their score.

A worked matrix for a 12-fragrance range

Here is an example brand stocking twelve CSI oils. Volume, hold and history scores are invented for the example; volatility follows the general family tendency described above and the notes listed on each product page.

Notice what the matrix does that instinct would not. Dark Vanilla, the least volatile scent on the list, sits in tier A because it is a big seller that waits a long time and has a colour flag. Lemongrass and Lime, highly volatile, sits in tier C because the example brand makes few and sells them fast. Volatility matters, but it is one risk of four.

How hard to test each tier

Tiers turn into candles and checkpoints. The design below is a suggested starting point; the checkpoints are examples you can move.

Add a fresh reference per SKU at each checkpoint, poured from a sealed retained oil sample, and a few unscented controls in the same wax. Tier A also gets a burn pair at every checkpoint; tiers B and C at their last one.

The oil for tier A’s aged candles is modest. Each tier-A SKU needs 12 candles × 16 g = 192 g, so two 100 g samples per oil: Citrus Lemon 2 × ₹300.00 = ₹600.00, Juicy Orange 2 × ₹749.00 = ₹1,498.00, Lavender 2 × ₹540.00 = ₹1,080.00 and Dark Vanilla 2 × ₹790.00 = ₹1,580.00. Together: ₹600.00 + ₹1,498.00 + ₹1,080.00 + ₹1,580.00 = ₹4,758.00 for the four highest-risk fragrances, before wax, jars and references.

Keeping twelve fragrances manageable

The practical difficulty with twelve scents is not the candles; it is the assessment sessions. Twelve jars and twelve references in one sitting will exhaust any nose, and nose fatigue makes later jars seem weaker than earlier ones. Split each checkpoint into short sessions of three or four pairs, with fresh air between them, and change the order each time so the same fragrance is not always smelled last.

Stagger the start dates by tier if the workload demands it, but keep every SKU within a tier on the same start day so they share one storage history. Store the whole set on the shelf where stock really waits, lidded and cartoned as sold, and note the shelf’s minimum and maximum temperature at each checkpoint.

Use one record sheet for the whole range: fragrance, tier, oil lot, pour date, checkpoint, cold-throw rating against reference, character notes, colour, burn result and verdict. A single sheet makes patterns visible — for instance, every fresh-opening scent softening at the same checkpoint, which points at the storage shelf rather than at any one oil.

Letting results move fragrances between tiers

The matrix is a starting order, not a sentence. Its whole value is that it changes when evidence arrives.

Review the whole matrix at least before each festive season and whenever your sales mix shifts. A slow seller that becomes a bestseller moves up on volume alone.

Connecting priority to purchasing

Test priority should also shape how you buy. Tier A fragrances, where fading is likeliest and costliest, are exactly the ones where an oversized oil order is most dangerous. Buy their production oil in quantities you will use inside the hold your tests have supported, as 1 kg packs — the largest oil pack CSI lists — or a WhatsApp quote for larger amounts; no bulk discount is published. Tier C fragrances can be bought as needed in smaller packs.

For every fragrance, and especially tier A, ask CSI on WhatsApp (+91 7397976926) for the IFRA certificate, MSDS and any storage or shelf-life guidance for that oil and lot, and keep the reply in writing. Paperwork answers what a supplier knows; your matrix and your aged candles answer what happens in your range.

Where this page fits

CSI already has guides that cover parts of this question. This page answers one fragrance-ageing decision; these cover the neighbouring questions:

Three things to buy for this decision

Frequently asked questions