My Citrus Candle Loses Its Top Notes Faster Than My Sandalwood Candle — Could More Volatile Fragrance Components Be Escaping During Storage?

Short answer: the lightest materials leave first

Every fragrance oil is a blend of many materials with different weights and volatilities. When a candle sits in storage, the lightest of those materials are the first to evaporate from the wax surface and the first to meet oxygen. In a citrus candle, the lightest materials are exactly the ones that make it smell like lemon: the bright, sharp opening. In a sandalwood candle, most of the character sits in heavy woody materials that move slowly.

CSI's Citrus Lemon page describes its structure as lemon and lime at the top, grapefruit and orange in the middle and mandarin at the base, with a tip that citrus top notes are volatile and fade faster than warmer families, so the page advises curing the full 48–72 hours and working at the upper end of the stated load range. The Sandalwood page lists a 203°C flashpoint and 0% vanillin — a heavy, slow profile by design. Put those two pages side by side and your observation is what you would expect.

What you cannot do is turn that into a number. CSI publishes no shelf life, no evaporation rate and no ageing data for any oil, and nobody can tell you that lemon loses a fixed share per month. What you can do is measure how your lemon candle changes, in your jar, on your shelf, against a sandalwood candle and a fresh reference.

Why citrus and woods age differently

Three things work together. First, volatility: light citrus materials have the highest tendency to escape from the wax surface, especially when the lid is off or the room is warm. Second, oxidation: many fresh citrus materials react with oxygen more readily than woody and musky materials, and oxidised citrus tends to smell flatter, sharper or slightly sour rather than just weaker. Third, balance: as the top recedes, the slower base becomes relatively louder, so the candle can smell "different" even though most of the oil is still in the wax.

A sandalwood candle has far less to lose at the top. Its character is carried by materials that stay put, so a few months on a shelf move it less. That does not make the sandalwood oil "better"; it makes it a different family with a different storage expectation.

The paired test that proves it

Make both candles on the same day in the same wax, jar and wick, so storage is the only variable that differs with time. The candle counts and test days below are suggested starting points, not a standard.

If the lemon top softens while sandalwood stays close to its reference and the unscented control is unchanged, volatility of the citrus top is the main story. If the lemon candle develops a sharp or sour edge, oxidation is likely involved as well, and storage conditions deserve as much attention as the oil.

Perception traps that exaggerate the gap

Before blaming volatility, rule out the ways your own nose can widen the difference. Citrus is a sharp, attention-grabbing note; you notice when it is missing far more readily than you notice a slightly softer wood. Familiarity plays a part too: after weeks of smelling lemon on the production floor, your sensitivity to it drops while sandalwood, smelled less often, still registers.

Room temperature matters. A candle smelled in a warm room gives off more cold throw than the same candle in an air-conditioned office, so a comparison across two days and two rooms can show a gap that is really the weather. Comparing with memory is the weakest test of all. Always set the aged candle beside a reference candle in the same room at the same time, and ask a second person to score without knowing which jar is which.

What you can change — in order of cost

Start with the cheapest levers. Lids on through storage and display slows top-note loss from the surface. Shorter holds for citrus — make citrus candles closer to dispatch than woods. Load at the upper end of the stated range, as the Citrus Lemon page suggests, so there is more top to start with. Using your own 200 g example, moving from 8% to 10% takes the oil from 16 g to 20 g per candle.

At CSI's 1 kg price that is easy to cost. Citrus Lemon at ₹2,832.00 per kg is ₹2.832 per g, so 16 g × ₹2.832 = ₹45.31 per candle and 20 g × ₹2.832 = ₹56.64 per candle. Sandalwood at ₹5,026.80 per kg is ₹5.0268 per g, so 16 g × ₹5.0268 = ₹80.43 per candle. Those figures exclude wax, jar, wick, packaging, labour, shipping and GST.

If those levers are not enough, test another citrus oil rather than another wax first. CSI lists Zesty Lemon, Juicy Orange, Lemongrass and Lime and Bergamot Amber alongside Citrus Lemon; each may hold differently in your system, and only a side-by-side log will tell you which. A blend with woods under the citrus is another route, but it is a new formula and needs its own wick and storage test.

How this changes what you buy

Family behaviour should shape your purchase quantities. If your log shows the lemon candle is acceptable to you for a shorter time than the sandalwood candle, buy lemon oil in smaller, more frequent lots and sandalwood in larger ones. A cheaper per-gram price on a bigger lemon order is not a saving if the last part of it goes into candles you would not sell.

For sampling, the Citrus Lemon 100 g pack is ₹300.00 — enough for six 16 g test candles. Sandalwood's 15 g, 50 g and 100 g packs are out of stock on the 8 October 2026 pull, so a sandalwood arm needs the 500 g pack at ₹2,513.40 or the oil you already hold. Ask on WhatsApp (+91 7397976926) for the IFRA certificate, MSDS and any storage guidance for the specific oil and lot, and get it in writing before ordering in kilograms. Our oil pages publish no shelf life, so do not plan around one you have not tested.

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