Should I Keep a Freshly Manufactured Reference Candle to Compare Against Samples Stored for Three and Six Months?

Yes, and here is what a reference really is

Keeping candles from each batch is one of the most useful habits a candle business can have. When a customer says a candle smells weaker than the last one, when a new oil lot seems different, or when you need to decide how long to hold stock before Diwali, retained candles turn an argument into a comparison.

But the word 'fresh' causes confusion. A candle you put aside on production day is fresh on that day only. Every week it sits on a shelf, it ages, just as your stock does. Open it at six months and you are holding a six-month-old candle. That makes it an excellent witness to how your stock has aged. It does not tell you what fresh smells like, because it no longer is.

A good programme therefore keeps two kinds of reference. Retained candles age alongside your stock. A sealed oil sample from the same lot lets you make a genuinely fresh candle on the day you compare. Put the two side by side and you can see the change, rather than remember it.

The three comparators you need

Production retains, stored like stock

These sit in the same storeroom, at the same height, in the same packaging as the candles you sell. When you open one at three or six months, it represents what a customer who bought at that age would receive. This is the comparison that matters commercially.

A best-case retain

Keep one candle per batch in the coolest, darkest, most stable spot you have, lidded and boxed. If it holds up well while the stock-shelf candles do not, your storage conditions are part of the problem, and improving them may solve it without changing the formula.

A same-day fresh remake

Decant a portion of the oil lot into a small, clean, well-sealed container with as little headspace as possible, label it with the oil name, lot and date, and store it cool, dark and upright. At each test point, pour a fresh candle from it with the same wax type, jar and wick, cure it to the oil page's stated minimum, and compare. The retained oil itself ages slowly in those conditions, which is why many makers also compare against the current lot as a cross-check.

A worked retention plan for one batch

Take an example batch of 120 candles of 150 g in CSI 464 with CSI Lavender at 8% of total weight, poured into 150 g clear jars with golden lids and Eco C1 wicks. Each candle is 138 g wax and 12 g oil. The test points of three and six months are suggested starting points; match them to how long you actually hold stock.

Six retained candles from 120 is 5% of the batch. Two candles per opening point matter: one is for scoring cold, the other for a supervised burn, because cold throw and hot throw are separate measures.

The oil figure uses Lavender 1 kg at ₹5,221.00, so ₹5.221 per g. The 50 g held back covers four fresh remakes of 12 g with 2 g to spare. If you prefer, a separate sealed 100 g pack at ₹540.00 can serve as the retained sample, though a portion of the actual production lot is the more faithful reference.

Labelling and records

Retained candles are only useful if you can find them and trust what they are. Write the batch code, oil name and lot, wax and bag, pour date and planned opening date on the base of each candle, not only on its box, because boxes get separated. Keep a single sheet per batch listing every retained item and where it sits. When you open a set, record the date, the scores and who assessed them on the same sheet.

Store retained candles where nobody will sell them by mistake. A clearly marked shelf or a labelled crate in the stock room works, provided it is in the same conditions as the stock. A retained set that ends up in the coolest cupboard because it is out of the way stops representing your stock and becomes a second best-case set.

When to stop retaining

Keep each batch's spare until the longest period a customer could reasonably still be using a candle from that batch has passed, by your own judgement. After that, the retained candles can be burned as a final full-life check, which tells you how the formula performs from the top of the jar to the bottom after a long hold.

How to run a three- or six-month comparison

What the results let you decide

Stock retains close to fresh at six months. Your formula holds in your storage for at least that long. That supports holding stock for that period, and no longer than you have tested.

Stock retains weaker, best-case close to fresh. Storage conditions are costing you fragrance. Improve the storeroom before changing oil.

Both retains weaker than fresh. The formula itself changes over that period, even in good conditions. Sell it within a shorter window, or test an alternative oil or wax against it.

Whatever you find, never promise customers that a candle will smell unchanged for a set time. Promise only what your own retained candles at your own test points support. CSI's fragrance oil pages publish no shelf life or storage guidance, so ask on WhatsApp (+91 7397976926) for the IFRA certificate, MSDS and any storage guidance for the oil lot, and keep the reply in your batch file beside your retained-sample records.

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