How Do I Develop an Indian-Climate Candle Stability Protocol Covering Warehouse Heat, Light Exposure, Temperature Cycling, Packaging and Fragrance Performance?

Why a written protocol, not a series of tests

Most makers test stability one problem at a time: a weak candle after summer, a yellowed jar in the window, a musty carton in the monsoon. Each test answers one question and is then forgotten. A protocol is different. It is a fixed method — same arms, same check points, same scorecard, same pass rules — that you run for every new oil, wax, jar or packaging change. After a year you have a library of comparable results for your own climate, which no supplier can give you.

For Indian conditions the protocol needs to cover the things that actually hurt candles here: non-AC warehouse heat, rooms under metal roofs, daily warm–cool swings, sun through windows and long hours of shop lighting, monsoon damp on packaging, and the time stock sits before a festival. It also needs to separate fragrance change from wax odour and from packaging, which is why unscented controls and packaging arms are built in.

The six storage arms

Every arm gets three scented candles and one unscented control from one batch: one oil lot, one wax lot, one pour session, one jar and one wick. Three scented candles give one per scored check and a spare; the counts are suggested starting points.

Put a min/max thermometer or data logger in every arm, at the candles, and read it at each check. A warm-hold arm whose cabinet drifts is not the arm you planned.

Check points, scorecard and pass rules

Start day 0 after your normal cure; CSI's soy oil pages commonly state 48–72 hours before burn testing, and many makers re-check at one to two weeks. At each check point, take one candle from each arm due, bring them to the same room to reach the same temperature, and score them blind against Arm A — and, where you can, against a freshly made candle from the retained oil sample.

Write the pass rules before you start. For example: a candle passes a check if its cold-throw and hot-throw scores are within a margin you choose of Arm A, with no off-note and no colour change beyond what you accept. The margin is yours. Fixing it in advance stops you moving the goalposts when a result is inconvenient.

Protect the oil side of the protocol

Retain a sealed sample of every oil lot, cool and dark, labelled with oil name, lot and date. Keep two or three candles from every production batch in Arm A conditions. When a complaint comes in, or a new lot smells different, these are your evidence.

Check incoming oil against the retained sample before production. If a bottle looks cloudy after cool storage, warm the closed bottle in warm water, mix thoroughly and re-check. If it stays hazy, has separated into layers, shows sediment or smells sour, sharp or solvent-like, quarantine the lot and ask the supplier. Do not try to fix it by adding other materials.

None of CSI's fragrance-oil pages carries a shelf life, a storage temperature or ageing data. Ask us on WhatsApp (+91 7397976926) for the IFRA certificate, MSDS and any storage or shelf-life guidance for the specific oil and lot, and keep the answer in writing with your protocol file. The 60-month shelf life on CSI 464 and CSI 468 is a wax statement — record it as such, never as the shelf life of a scented candle.

Indian calendar points to build in

Line the check points up with how your stock really moves. If you make festive stock months ahead, make sure Arm B runs at least as long as your longest hold, from pour to the customer's hands, including dispatch and retail time. If summer is your hottest storage, start a run in March or April so the real-time arm lives through it. If monsoon cartons are a worry, keep Arm F running through the wet months and note carton condition at every check.

A starter kit, costed

For a starter run with 150 g candles in the Clear Glass Jar with Golden Lid (stated 150 g fill, hot pour up to 85°C) at 8% load: 138 g wax + 12 g oil per scented candle.

Oil: 18 scented candles × 12 g = 216 g. Jasmine in three 100 g packs: 3 × ₹430.00 = ₹1,290.00. The 84 g left over becomes your retained sample for this lot. Jasmine's page lists a 185°C flashpoint and up to 10% in soy; add the oil below that flashpoint, and pour at or below the jar's stated 85°C hot-pour limit.

Wax: 18 × 138 g = 2,484 g for scented candles plus 6 × 150 g = 900 g for controls, 3,384 g in all. CSI 464 is the same price per kg at every pack, so 4 × ₹507.40 = ₹2,029.60 for 4 kg. Jars: 24 needed, as one pack of 20 and one of 10: ₹1,888.00 + ₹944.00 = ₹2,832.00, leaving six spares. Wicks: Eco C1, pack of 50, ₹295.00 — wick-test in this jar first.

Total: ₹2,029.60 + ₹1,290.00 + ₹2,832.00 + ₹295.00 = ₹6,446.60, excluding thermometers, cartons, labels, labour and GST. Every later run of the same protocol reuses the method; only the oil, and whatever you are testing, changes.

From protocol results to decisions

Use the results in order. Arm B sets your holding limit for that formula: hold stock no longer than the longest check it has passed. Arms E and F set display and packaging rules. Arms C and D rank options and warn you early. Then size purchases to match: buy no more oil than you will use within the period Arm B has supported. CSI lists no oil pack above 1 kg; larger quantities are multiple 1 kg packs or a WhatsApp quote.

Re-run the protocol whenever the oil lot, oil, wax, jar, wick or packaging changes, and keep every scorecard. Never promise customers that a fragrance stays unchanged; promise only what your protocol has shown, and tell them how to store the candle — cool, out of direct sun, lid on.

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