Should I Retest My Wick Every Time I Change Candle Fragrance?

The policy in one table

A promise of a full wick test for every new scent is hard to keep, because two weeks and five candles per oil is a lot when you are adding a Diwali range. Never retesting risks, sooner or later, 40 candles of a vanilla poured on a wick chosen for a citrus. The answer is a policy with a cheap tier for low-risk changes and an expensive tier kept for the changes that earn it. The procedure for the full retest itself is in How to Choose a Wick After Changing Fragrance Oil; this page decides when to use it.

The 2-point threshold and the weight classes below are our judgement, not published standards. They are set conservatively: a change that falls exactly on a boundary goes to the higher tier. If you are over either ceiling (the wax page's or the oil page's stated maximum), there is nothing to test yet: bring the load down first.

Is it actually the fragrance change? Other triggers

A wick retest is about the whole candle, and the oil is only one part of it. Some common reasons a trusted wick suddenly misbehaves have nothing to do with the new fragrance. If any of these changed, a retest is due even if the oil did not change at all, and blaming the new oil would send you in the wrong direction.

Weight classes: sort oils before they arrive

The question "same weight class or lighter?" needs classes. Ours are based on stated notes, because that is what a product page gives you; they are judgement, and an oil that sits on a boundary goes up a class. Heavier oils (dense gourmand, resinous, vanilla-rich) often need a wick adjustment, a tendency explored in Do Heavy Fragrance Oils Need a Larger Candle Wick?; what an oil does to a wick in general is the hub, Can Fragrance Oil Make a Candle Wick Too Weak?.

"Approved on this wick" means an oil you have already passed on this wick, in this jar and wax, at this load, with a record to prove it. If the only oil approved on your C1 is a light citrus, a floral is a class up and a vanilla is two; both go to the full retest the first time. Once one floral is approved, the next floral gets a quick check. The policy gets cheaper as your log grows.

When the page is silent

Of the 102 oils in CSI's range, 50 pages state a candle load or range in some form (two of them, Lavender Oud and Amber Oud Royal, only as "Candles (Soy/Paraffin/Blends) 10%" in a perfume usage table) and 52 do not. An oil with no stated load has no range to reassure you that your load is sensible for it, so our policy sends it to the full retest the first time, whatever its class. That is not a judgement on the oil; it is a judgement on how much the page tells you.

The quick check: one candle, one evening

A quick check is not a small bracket. It asks one narrow question: does the house wick still do its job with this new oil? It is valid only when everything else is identical to an approved recipe: same jar batch, wax, wick, load and trim. Worked example: Lavender at 8% on C1 in the Clear Glass Jar with Golden Lid (150 gram), where C1 is already approved for a light herbal oil.

When the full retest is mandatory

The full retest is a three-wick bracket in the new oil beside a reference candle in an approved oil, plus a repeat of the winner: five candles, fourteen days. We do not repeat the procedure here; it is set out step by step in How to Choose a Wick After Changing Fragrance Oil. What matters for policy is the trigger list, the cost and the rule that nothing goes to production until it passes.

Cinnamon Vanilla's page allows "Up to 13% load for candles", but in CSI 464 the wax's stated 10% governs, and we would bracket at 8%. The retest does not ask "how high can it go?"; it asks "which wick does it need at the load we sell?".

What the policy costs over a year

Worked example: a small business adds eight new oils in a year. Under the tiered policy, five are quick checks (light and middle oils onto wicks with approved neighbours) and three are full retests (a dense gourmand, an oil whose page states no load, and one oil introduced alongside a new jar). All costs are materials value at CSI live pricing, using the Lavender and Cinnamon Vanilla examples above.

The tiered policy uses ₹4,787.84 less in materials than retesting everything, and gets five of the eight oils to a verdict in days rather than two weeks. Never retesting looks free until the first failure: a single 41-candle batch lost to a wrong wick is worth 7.8 full retests. Figures exclude labour, freight, packaging and GST, and a lost batch also costs you time and, if it reaches customers, reputation, which no table prices.

The approved-wick log

The policy depends on one document: a list of which oils are approved on which wick, in which jar and wax, at which load, and by which tier. Without it, "same weight class as an approved oil" is a guess.

For a range that grows beyond a handful of oils, the log becomes a wick map, and the question of whether oils in one jar need different wicks is its own topic: Do Different Fragrance Oils Require Different Wick Sizes in the Same Jar?. The deep case of a wick that works with one scent and tunnels with another is My Candle Wick Works Perfectly With One Fragrance but Tunnels With Another — Do I Need Different Wicks for Every Scent?.

What to keep in stock

A policy only gets followed if the materials for it are on the shelf. Two non-oil items first, then three oils that illustrate the three weight classes. Oils are chosen on stated basis (page candle load, notes, vanillin and cure wording, price per gram, stock on 25 September 2026); CSI has no measured burn or throw data for any oil. Candle counts assume 150 g at 8%.

We sell the 500 g and 1 kg of all three oils. Under this policy none of them should arrive in bulk before it has passed its tier: 50 g covers a quick check with oil to spare, and a full retest with 2 g left.

Frequently asked questions