A candle doesn't spoil, but it does change on the shelf: the fragrance fades as its lighter notes evaporate, vanilla and some other scents turn the wax yellow or brown in light, and soy wax grows a white frost on top. A lid keeps the scent in; a sunny window speeds up every change. That's why candle makers date them for best scent, not safety. In the example below, an Oʻahu candle maker's lidded jars passed every test through day 360, and they're dated 270 days from the pour, a 25% margin. Below is what ends a candle's shelf life, how storage changes it, the study, the date on the label, and a free template.
The short version
- Candles don't spoil; scent and color change on the shelf.
- Fragrance fades as its lighter notes evaporate.
- Vanilla and some scents yellow in light.
- Soy wax can frost; it's cosmetic.
- Keep lids on and candles out of the sun.
- Run a real-time study and date for best scent.
- TaroStack gives every batch its date from the shelf life you set. More below.
What ends its shelf life
| What ends it | What happens | What slows it |
|---|---|---|
| Fragrance fading | Top notes evaporate; the cold and hot scent weaken | Lids; cool storage; the right fragrance load |
| Yellowing | Vanillin and some oils discolor the wax in light | UV-blocking additive; out of sunlight; lids |
| Frosting | White crystals on soy wax | Steady temperatures; pour temperature; cosmetic only |
| Wet spots | Wax pulls from the glass | Warm jars before pouring; cosmetic only |
Pouring by the melter is in how to make candles in bulk, and the margins on a jar in candles profit margin.
How it's stored
| Stored | In the example's tests | On the label |
|---|---|---|
| Lidded jar, room temperature, dark | Passed every test through day 360 | "Best scent within 9 months" |
| No lid, in a sunny window | Yellowed and weaker by day 60 in a side study | Lids on display candles |
| Burned, then left | Not part of the study | Customers are told to burn it within the year |
The lids cost a little and keep the scent the customer smelled in the shop.
An example: a shelf life study
Lehua Glow, the made-up candle maker on Oʻahu I use in these examples, kept lidded 9-ounce soy candles from one pour on a dark shelf and tested two at each pull, one sniffed cold and one burned:
| Test | Pass if | Day 0 | Day 90 | Day 180 | Day 270 | Day 360 | Day 540 |
|---|---|---|---|---|---|---|---|
| Cold scent score, 1 to 9 | at least 6 | 9 | 9 | 8 | 7 | 6 | 5 |
| Hot scent score, 1 to 9 | at least 6 | 9 | 9 | 8 | 8 | 7 | 6 |
| Discoloration, 1 to 5 | at most 2 | 1 | 1 | 1 | 2 | 2 | 3 |
| Frosting, 1 to 5 | at most 3 | 1 | 1 | 2 | 2 | 3 | 3 |
| All pass? | Pass | Pass | Pass | Pass | Pass | Fail |
Everything passed through day 360; at day 540 the cold scent fell below 6 and the wax had yellowed. Taking a 25% margin off day 360 gives 270 days, nine months. How the pulls and margin are planned is in shelf life testing.
The date on the label
No rule requires a date on a candle; makers who print one call it best scent, and it's there to protect the customer's first burn. A batch code on the bottom ties the jar to the pour, which matters when a customer writes about one that smoked. Selling them is in how to sell candles at farmers market, and the year in candle business plan.
Get the template
Download the candle shelf life study template. One sheet: the product, the lot tested, the day it was made, how it's stored and the margin to leave; then each test with its limit and the result at each pull. It marks each pull pass or fail, finds the last day everything passed, takes the margin off, and gives the shelf life for the label and the date for a batch made today. It's an ordinary Excel file with no macros, and it works in Google Sheets, LibreOffice and Numbers.
Where this stops working
The study gives one date for one candle. Fourteen scents, three sizes, pours every week, and a gift shop that holds stock for months: someone has to date each pour and send the oldest jars first.
How TaroStack does it
TaroStack gives every batch its date from the shelf life you set, and sends the oldest out first.
Dates from the shelf life. Each candle carries its shelf life in days, and each batch's lot gets its production date and the date that follows from it.
First-expired-first-out. Orders take the oldest lots first by default, and a gift shop can be set to take only stock with enough days left.
What's coming up. A forecast shows what will expire unsold and what it costs, and anything thrown out is recorded with its reason, expired or spoiled, so waste shows by item.
| The job | Spreadsheet | In TaroStack |
|---|---|---|
| The date on a batch | Worked out by hand | From the shelf life, on the lot |
| Which batch goes out first | Dates on tape | First-expired-first-out |
| Stock with enough days for a gift shop | Checked by hand | The customer's shelf-life rule |
| What expired last month | Not counted | Waste by reason |
Lots, dates, first-expired-first-out and the expiry forecast are on every plan, from $49 a month. The first 30 days are free, with no credit card. If you'd like a hand setting up, ask, and we'll do it with you.