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?

Why “equally strong” is a promise nobody can make

Your question has a hidden assumption in it: that there is a fact somewhere — on a label, in a certificate, in a supplier’s head — that tells you how a fragrance will smell three months from now inside your candle. There is not. Fragrance oils are mixtures. The lighter, more volatile materials, which are often the bright opening notes, can evaporate or oxidise more readily than the heavier woody, musky or vanillic ones. So even when very little oil has actually left the wax, the scent can lean differently after a few months: the opening recedes and the base seems to take over.

That shift depends on your wax, your load, your jar, whether a lid is on, the heat of the shelf and the oil itself. No one outside your workshop holds all six variables. CSI’s fragrance-oil pages publish no shelf life, no storage temperature and no ageing data for any oil. CSI 464 and CSI 468 state a 60-month shelf life, but that is a statement about wax kept cool and dry. It tells you nothing about how Lavender, Dark Vanilla or anything else behaves in a finished candle.

So replace the impossible question with an answerable one: does my exact candle, held for my exact journey, still meet the standard I set at day 0? That you can test, and you can test it before you pour 2,000.

What 2,000 candles commit you to

Work it out before you test, because the size of the commitment is the reason the test matters. This series calculates fragrance load as a percentage of total candle weight. A 200 g candle at 8% is 184 g wax and 16 g oil.

Two honest notes on those figures. First, no fragrance-oil pack above 1 kg is listed, so 32 kg means 32 one-kilogram packs at the listed price or a quote you request on WhatsApp — there is no published bulk discount to count on. Second, 368 kg of wax goes beyond CSI’s largest listed 10 kg pack; quantities like that are quoted on WhatsApp. These figures exclude jars, wicks, packaging, labour, shipping and GST.

Set ₹167,072.00 of oil beside ₹540.00 of sample. The pilot costs a fraction of one percent of the oil bill, and it is the only evidence you will have about the hold.

Count back from the day the customer opens the box

“Three months in advance” is a production date. Your fragrance has to survive to the moment a customer lifts the lid, which is later. Build the timeline backwards and find the longest hold, because that is the candle you must test.

In this example the first candle out of the melter is around 100 days old when it is finally lit, while the last one poured might be 40 days old. Testing a candle at 30 days and declaring the batch safe is testing the easy case. Test the hardest one. If your channels differ — some stock goes straight to a nearby shop, some sits with a marketplace — write a separate row set for each and take the longest total as your test length.

The pilot test, step by step

If 90 days have not passed before you must start the main pour, run a supervised warm-cabinet comparison alongside: one pilot at a warmer temperature you choose, monitored with a thermometer, never in a kitchen oven or a car boot. Use it only to spot a formula that weakens fast compared with another. It does not convert into “this will last three months”.

If the pilot fades: change the plan, not the promise

Suppose your day-90 candle is noticeably flatter than the fresh reference. You have more options than “hope”.

What you should not do is raise the load blindly to “bank” extra scent. A higher load changes wicking and sweating behaviour and must be tested in its own right, below the oil’s published flashpoint when you add it.

What to tell customers and what to ask CSI

Customer copy should say what you tested, not what you hope. “Best enjoyed within the Diwali season” is honest if your pilot covered that hold. “Smells as strong as the day it was made” is not a claim any candle maker can support.

Before you buy 32 kg, message CSI on WhatsApp (+91 7397976926) for the IFRA certificate, the MSDS and any storage or shelf-life guidance for that oil and that lot, and keep the reply in writing. Then buy only the kilograms your waves need, when they need them. Smaller orders placed closer to each pour can beat one large order that sits for months — even when it means CSI sells you less at once.

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