Should I Test Fragrance Retention in Candles Displayed Under Retail Lighting Compared With Candles Stored in Closed Cartons?

Why lights and cartons are worth comparing

Most makers store finished stock in closed cartons and display a selection on shelves under shop lights. Those display candles can sit there for weeks, lids off so customers can smell them, warm from nearby fittings, exposed to light all day. If a customer buys the display candle, or if display stock goes back into cartons after a season, the question is real: did those weeks change it?

As general fragrance practice, oxygen, heat and light are the usual drivers of change. An open candle on a shelf meets all three. A lidded candle in a carton meets very little of any. So a comparison is not academic — it tells you how long display stock stays at your standard, and which part of display life does the damage.

Design the test so it answers one question at a time

A common version of this test compares an open, lit candle with a closed carton candle and stops there. The trouble is that two things changed at once: light and warmth, and the lid. If the lit candle smells weaker, you cannot tell which caused it. Add a lit group with lids on and you can.

Four candles per group is a suggested starting count: one for each scored check and a spare. Pour everything from one oil lot, one wax lot and one pour session, in the same jar, with the same wick, and code the jars on the base so the scorer cannot see which group is which.

Put a min/max thermometer on the shelf beside groups A, B and D, and another in the carton store. Record the lighting type and the distance from the nearest fitting. If the shelf reading runs well above the stockroom, warmth is in play as well as light.

Note the light source too. Older halogen spotlights run hot close up; many LED fittings run cooler at the candle but are still on for long hours. You do not need to know the physics — you need the thermometer reading at the jar and the hours the lights are on, recorded beside your scores.

Record the shop hours as well. A shelf lit twelve hours a day, seven days a week, gives display candles far more exposure than one lit for eight hours on weekdays, and that difference belongs on the scorecard beside the temperatures.

Score blind at test points you choose

Pick check points that match how long your display stock really lasts. A suggested start is day 14, day 30 and day 60; if candles sometimes sit on display for a season, add a later point. At each check, take one candle from every group.

Record every score with the date and the test-point day. Over three test points you will see whether Group A drifts away from Group C, whether Group B stays close to C (pointing to air loss as the main driver) or drifts with A (pointing to light and warmth), and whether Group D has picked up a smell of its own.

Reading an example result

Suppose, as an illustration only, the day-60 scores for opening freshness come back as: Group C 4, Group B 4, Group A 2, Group D neutral. Lids on held the scent close to the carton reference under the same lights, so open air on the shelf was the main loss — not the lighting. If instead A and B both scored 2 against C's 4, the lit shelf itself is doing the damage, lid or no lid, and the fix is the position or the fitting. Your scores will differ; the logic of reading them does not.

Write down which result would change your routine before you start. It is easy to explain away an inconvenient score afterwards; it is much harder when you have already decided that a two-point drop in Group A means lids stay on from now on.

What the test costs to run

Using 200 g candles at 8% load, each candle needs 16 g of oil and 184 g of wax. Twelve scented candles (groups A, B and C) need 12 × 16 = 192 g of oil; the unscented control needs none. Round up for one fresh reference candle at each test point and you are at roughly 16 scented candles, or 256 g of oil.

For a test, three 100 g packs of Bergamot Amber cover it: 3 × ₹560.00 = ₹1,680.00 for 300 g. The 500 g pack is ₹2,718.00, cheaper per gram — 256 × ₹5.436 = ₹1,391.62 worth of oil used — but it leaves 244 g sitting in a part-used bottle while you wait for results. Unless you already know you will use the remainder soon, the smaller packs are the more sensible buy for a test, even though CSI makes less from them.

Wax for 17 candles (16 scented plus the control) is about 3.3 kg of CSI 464, which is the same price per kg at every pack size: 4 × ₹507.40 = ₹2,029.60 for 4 kg. All figures exclude packaging, labour and GST.

Turning results into a display rule

If Group A drifts and Group B does not, keep lids on display candles and offer a separate tester. If both lit groups drift and the carton does not, the light or the warmth near it is the problem: move display stock further from fittings, rotate it sooner, or display dummies. If nothing drifts within your display period, keep your current routine and re-check when you change oil, wax or lighting.

Repeat the test whenever something in the system changes: a new lighting fit-out, a new shelf position, a new oil lot, a new wax. The design stays the same; only the date on the scorecard changes. Keep the scorecards together so you can see how one season compares with the next.

If every group, including the carton, has moved away from a fresh reference, the oil itself is changing over that period in your system — a shelf-life question, not a lighting one. CSI fragrance-oil pages publish no shelf life or storage temperature. Ask us on WhatsApp (+91 7397976926) for the IFRA certificate, MSDS and storage guidance for your oil and lot, in writing, and set any display or sale limit from your own results, not from the 60-month wax shelf life on CSI 464.

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:

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