My Candles Near the Warehouse Entrance Smell Different From Those Stored Inside — Should I Investigate Heat and Sunlight Exposure?

Why the entrance is the first suspect

When candles poured on the same day from the same oil lot smell different depending on where they sat, the formula is not the variable. The position is. A warehouse entrance in India is usually the least stable spot in the building: the shutter opens to afternoon sun, outside air flows in on every delivery, and vehicles idle a few metres away. The rack ten metres inside sees none of that.

Heat is the most likely driver. As general fragrance practice, lighter, more volatile materials — many fresh, citrus and green top notes — leave the wax surface and age more readily when warm, while heavier woody, musky and vanillic materials hang on. So a lavender candle that sat by the door may smell flatter and more musky, while the same candle from the inner rack still opens fresh. Nothing has to be wrong with the oil for that to happen.

Sunlight adds a second effect. Direct sun on glass warms the wax surface far more than the air reading suggests, and light itself can shift colour in some waxes and in vanillin-containing oils. Dust, exhaust and the smell of cardboard or diesel near a loading door can also sit on a lidless candle and change what you notice when you smell it.

Measure the shelf, not the building

The thermostat or the weather app tells you nothing about the shelf by the shutter. Put a min/max thermometer or a small data logger at the exact height and position where the entrance stock sits, and another on the inner rack. CSI does not sell these; any basic min/max unit is enough. Read and reset them at the same time every day for at least a week — a suggested starting period — and note whether sun reaches each shelf, and for how long.

Those figures are an illustration of the kind of gap people find, not a prediction for your building. Your own log decides. If the entrance swing is much wider than the inner rack, or the entrance shelf gets sun at all, you already have a strong lead. If the readings are almost identical, look harder at handling, lids left loose, dust and nearby odours.

What is sitting by the door, in rupees

Put a number on the stock before deciding how much effort to spend. Take an example: a reader has a batch of 300 lavender candles, 200 g each at 8% load (184 g CSI 464 + 16 g oil), with 80 of them stored near the entrance — the counts are the reader's example figures.

Oil per candle: 16 × ₹5.221 = ₹83.54, using Lavender 1 kg ₹5,221.00. Oil in the entrance stock: 80 × ₹83.54 = ₹6,683.20. The full materials cost of one candle in a matte 200 ml jar with an Eco C1 wick, from the series example, is ₹253.60, so materials sitting by the door: 80 × ₹253.60 = ₹20,288.00. That excludes packaging, labels, labour, shipping and GST.

Against that, a week of logging and a dozen comparison candles is cheap. Moving 80 candles to an inner rack costs only labour. Changing oil means new tests, new wicking checks and new stock — the most expensive answer, and the wrong one if the oil was never the problem.

Run a matched comparison and a swap test

You want one variable: position. Everything else must match — batch code, pour date, jar, lid, carton, oil lot. Then compare the candles the same way, in the same room, at the same time.

If the unscented control at the entrance develops a smell of its own — dusty, waxy, smoky — part of what you noticed was the wax or the environment, not the fragrance. If the control stays neutral but the scented entrance candles lose their opening, heat and light on the fragrance is the stronger explanation.

Decide: fix the spot, then judge the oil

Read your results in order. If only the entrance set is the outlier, the fix is storage: keep finished stock out of the sun line, use the entrance only for goods in transit, shade or screen the door, keep cartons closed, and rotate stock so nothing sits by the door for long. Re-check after the change with the same scorecard.

If every position has drifted compared with the fresh reference, the oil or formula may simply change over your holding period — even in your best spot. That is a fragrance and shelf-life question, and the answer is real-time testing in your own storage, not a guess.

CSI fragrance-oil pages publish no shelf life, no storage temperature and no ageing data. Ask us on WhatsApp (+91 7397976926) for the IFRA certificate, MSDS and any storage or shelf-life guidance for that oil and lot, and get the answer in writing. The 60-month shelf life on CSI 464 and CSI 468 is a wax statement; it tells you nothing about how a fragrance behaves at your entrance.

A simple rotation rule

Once the spot is fixed, write a rotation rule into the warehouse routine. Finished candles go to the inner racks on the day they are packed; the entrance holds only cartons waiting for pickup that day; any candle that has sat by the door longer than your chosen limit is pulled and checked against the retained candle from its batch before dispatch. The limit is yours to set from your own swap test — start conservatively and relax it only when results support it.

Label every carton with the batch code and the date it went onto the shelf. When a customer later says a candle smelled weak, you can see whether that carton ever sat by the door, and compare it with retained candles from the same pour.

And whatever you find, do not promise a customer that a candle will smell exactly as it did on the day it was poured. Promise only what your own testing supports.

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