Should I Keep Retained Samples From Each Candle Batch and Evaluate Them Periodically Throughout Their Intended Shelf Life?
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How many candles per batch? A suggested starting point is one per scheduled pull point plus two in reserve, for example six for pulls at 30, 60, 90 and 180 days.
Where should retained candles be stored? Where stock is stored, sealed and packed as sold, with a min/max thermometer at that shelf height.
What do I compare a retained candle against? Your written approved standard and a fresh candle from current production, assessed side by side and coded.
Retained candles do two different jobs
Yes, keep retained candles from every batch, and yes, evaluate some of them on a schedule. But be clear that these are two separate jobs that happen to use the same jars. The first job is defence: when a complaint arrives about batch X, you need an untouched candle from batch X to compare against. The second job is evidence: opening retained candles at planned ages is how you find out whether your intended shelf life is real or merely hoped for.
The defence job needs a retained candle from every batch without exception. The evidence job does not have to cover every batch at every pull point. If you pour twenty batches a month, opening candles from all of them at four ages would swamp your bench. Instead, run a full schedule on selected batches of each formula, rotating which batches are chosen, and keep the rest in reserve for complaints.
Start from the shelf life you intend, then test past it
Your intended shelf life is a business figure: how long a candle may realistically sit between pouring and a customer lighting it, including your storage, transit and any retail holding. It is your number, not a supplier's. CSI fragrance-oil pages publish no shelf life, storage temperature or ageing data for any oil, and the 60-month shelf life stated for CSI 464 and CSI 468 describes the wax in cool, dry storage, not a fragrance inside a candle. Ask CSI on WhatsApp (+91 7397976926) for the IFRA certificate, MSDS and any written storage guidance for the oil and lot you use, then let your own retained candles decide.
Plan your last pull point at or beyond the intended shelf life. If you intend 180 days and only ever test to 90, you have evidence for 90 days and an assumption for the rest. The schedule below is a suggested starting point for one formula with an intended 180 days.
| Pull point | Candles opened | What you assess | Compared against | Decision it informs |
|---|---|---|---|---|
| Day 0 (after stated cure) | Production candle, not retained | Character, cold throw, hot throw, colour, surface | Approved standard | Release the batch |
| Day 30 | 1 | Same list, cold throw blind | Fresh candle from current production | Early drift warning |
| Day 60 | 1 | Same list, plus burn to a full melt pool | Fresh candle | Confirms trend direction |
| Day 90 | 1 | Same list | Fresh candle | Mid-life check |
| Day 180 | 1 | Same list, full supervised burn session | Fresh candle | Supports or shortens the intended window |
| Complaint reserve | 2 | Only if a complaint or query arrives | Fresh candle | Defence, never opened on schedule |
Each pulled candle is consumed by the assessment: the jar has been opened and the candle burned, so it cannot go back into the programme. That is why the reserve is separate. If you raid the reserve to fill a missed pull point, the batch has nothing left for the complaint that arrives in month five.
Worked example: what six retained candles cost
Take a 150 g Bergamot Amber candle in CSI 464, poured in the clear apothecary jar with a golden lid, with an Eco C1 wick. At 8% of total weight the candle holds 138 g of wax and 12 g of oil. Using the 10 kg CSI 464 price and the 1 kg Bergamot Amber price, the materials are 138 g × ₹0.5074 = ₹70.02 of wax, 12 g × ₹5.437 = ₹65.24 of oil, ₹94.40 for the jar and ₹5.90 for the wick, so ₹70.02 + ₹65.24 + ₹94.40 + ₹5.90 = ₹235.56 per candle before packaging, labour and GST.
Six retained candles from a batch on the full programme cost 6 × ₹235.56 = ₹1,413.36. If that batch is 120 candles, an example size, its materials come to 120 × ₹235.56 = ₹28,267.20, and the retained six are 5% of it. Batches held only for defence need just the two reserve candles, 2 × ₹235.56 = ₹471.12. Rotating the full programme across batches keeps the overall cost well below 5% of output while still building evidence for every formula.
What each pull should record
Keep the record identical at every pull point so results line up. Note the date, the candle's age in days, the storage readings since the last pull, who assessed and whether the jars were coded. Score character in a few plain words, cold throw on your usual scale after the same lid-off time, any off-note, wax colour against the day-0 photo, and surface condition. Then burn the candle under supervision and record hot throw and burn behaviour in the same room you used at approval.
Photograph the top of every pulled candle beside the fresh one before burning. Colour drift, sweating and frosting are much easier to judge from a row of dated photos than from memory, and vanillin-containing oils in particular can warm the wax colour over time, as several CSI vanilla, coffee and chocolate oil pages note.
How to store retained candles so they mean something
A retained candle only represents your stock if it ages the way your stock ages. If finished cartons sit on rack C in a non-air-conditioned room, retained candles belong on rack C too, in the same packaging, not in a cool office drawer. Some makers keep two sets: one with stock, to show what customers receive, and one in steady, cooler conditions, to separate formula ageing from storage stress. That doubles the jars but halves the arguments.
Turning results into decisions and orders
Read results per formula, not per batch. One retained candle that slipped at day 90 might be a storage hiccup; three batches in a row slipping at day 90 is the formula telling you its real window. Shorten that formula's working window, pour it closer to sale, and test an alternative oil from a 100 g sample before changing wax or wick. For buying, the honest consequence runs against our interest: if your retained candles say a formula holds well for 90 days but not 180, do not buy six months of its oil because the 1 kg pack is cheapest per gram. Buy what you can pour and sell inside the window your evidence supports, and never promise customers the fragrance will stay unchanged.
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
| Option | Price | Status on the October 2026 pull |
|---|---|---|
| Pack of 10 | ₹944.00 | In stock |
| Pack of 20 | ₹1,888.00 | In stock |
| Option | Price | Status on the October 2026 pull |
|---|---|---|
| 15 g | ₹105.02 | In stock |
| 50 g | ₹280.00 | In stock |
| 100 g | ₹560.00 | In stock |
| 500 g | ₹2,718.00 | In stock |
| 1 kg | ₹5,437.00 | In stock |
| Option | Price | Status on the October 2026 pull |
|---|---|---|
| 500 g | ₹260.00 | In stock |
| 1 kg | ₹507.40 | In stock |
| 5 kg | ₹2,537.00 | In stock |
| 10 kg | ₹5,074.00 | In stock |
CANDLEMAKINGSUPPLIESINDIA supplies raw materials and production equipment, not finished candles. This guide separates general fragrance-ageing practice from what CSI's own product pages state, says plainly that CSI's oil pages publish no shelf life, storage temperature or ageing data, treats the 60-month shelf life on the CSI 464 and 468 pages as a wax statement only, and labels every test day, cabinet temperature, candle count, reject rate or lead time as a starting point or the reader's own figure.
Prices are live CSI prices from October 2026; product pages are authoritative. No fragrance-oil pack above 1 kg is listed, so larger quantities are shown as multiples of the 1 kg price; ask for a quote rather than assuming a discount.
For bulk quotes, GST invoicing, IFRA and MSDS documents, message us on WhatsApp at +91 7397976926.
Frequently asked questions
- Should I Keep Retained Samples of Wax, Fragrance, Wicks, Dyes and Packaging From Every Commercial Batch Used in Production?
- My Customer Says Their Candle Smells Different From a Previous Purchase — How Do I Determine Whether Ageing or a Raw-Material Lot Change Is Responsible?
- How Do I Compare an Older Production Batch With a Newly Manufactured Batch Without Letting Personal Scent Familiarity Distort the Result?
- Should I Use Blind Smell Comparisons to Identify Fragrance Changes Between Fresh and Aged Candle Samples?
- My Business Is Growing and Inventory Is Increasing — How Do I Avoid Buying so Much Fragrance Oil That It Ages Before I Can Use It?
- How Do I Calculate Fragrance Oil Reorder Quantities Using Monthly Candle Demand, Supplier Lead Time and Remaining Raw-Material Shelf Life?
- How Do I Build a Candle Inventory System That Balances Festive Demand, Fragrance Stability, Production Lead Time and Working Capital?
- I Want to Manufacture 2,000 Diwali Candles Three Months in Advance — How Do I Know the Fragrance Will Still Smell Equally Strong When Customers Receive Them?
- Should I Manufacture My Most Volatile Citrus Fragrances Closer to Diwali Than My Woody Fragrances or Rely on Tested Shelf-Life Data?
- A Customer Complaint Appeared Three Months After Production — How Can Retained Raw-Material Samples Help Determine Whether the Supplier Batch Contributed?
- How Do I Establish a Realistic Fragrance Shelf Life for My Finished Candles Rather Than Assuming Every Fragrance Remains Unchanged Indefinitely?
Customer reviews: The reviews at the top are genuine, published Judge.me reviews — Suvarna P (5★, verified); Jinal Patel (5★, verified); Monika Deep (4★, verified); Radhaa S (5★, verified); Arminder Kaur (5★, verified); Avanthi Cheeli (5★, verified). Names, ratings, dates and products as recorded by Judge.me.
Product facts (October 2026, CSI live store): Clear Glass Jar with Golden Lid (150 gram): Pack of 10 ₹944.00, Pack of 20 ₹1,888.00 — page: height with lid approx. 8 cm, outer rim approx. 7 cm, base approx. 6.5 cm, 150 g fill, safe for hot pour up to 85°C. Bergamot Amber Fragrance Oil: 15 g ₹105.02, 50 g ₹280.00, 100 g ₹560.00, 500 g ₹2,718.00, 1 kg ₹5,437.00 — top bergamot and citrus, heart amber with soft floral, base woody musk and vanilla · soy 6–10%, paraffin 6–8% · page intensity guide: 6% bergamot leads, 8% balanced, 10% amber comes forward and vanilla/musk base becomes more prominent. Luxury Soy Wax CSI 464 (flakes): 500 g ₹260.00, 1 kg ₹507.40, 5 kg ₹2,537.00, 10 kg ₹5,074.00 — 100% soy container wax in flakes · single pour · stated fragrance load up to 10% · stated shelf life 60 months (cool, dry storage).
Assumptions: Fragrance load is a percentage of total candle weight (200 g = 184 g wax + 16 g oil at 8%). CSI fragrance-oil pages publish no shelf life, storage temperature or ageing data; the 60-month shelf life on the CSI 464 and 468 pages refers to the wax. Accelerated heat or cycling tests compare options and do not predict an exact shelf life. Every test day, temperature, candle count, reject rate, lead time and cost of money is a suggested starting point or the reader's own figure. No fragrance-oil pack above 1 kg is listed; larger quantities are shown at the 1 kg price and quoted on WhatsApp. Fragrance-oil prices re-checked 8 October 2026, wax prices 7 October 2026; product pages are authoritative.