My Supplier Says Their New Vanilla Is a Direct Replacement for the Old One — Should I Assume Its Wick Behaviour Will Also Be Identical?

What "direct replacement" can honestly mean

"Direct replacement" is a sales phrase, not a test result. When a fragrance supplier uses it, they usually mean one or more of three things: that the new vanilla smells like the old one, that it can be used at a similar load, and that it slots into the same price and pack structure. Some suppliers mean more — that the new oil is the old formula under a new code, or that it has been tried in a wax similar to yours. Very few mean "your wick will behave identically in your jar", because they have never burned your candle.

Wick behaviour is not a property of the oil. It is a property of the system: the wax, the oil and its load, the wick, the jar, and the fill. In general candle-making practice, the fragrance portion can influence how thick the melted pool is and how readily it climbs the wick, how much carbon collects on the wick tip, and how much heat the flame puts back into the pool. A new vanilla that smells the same can still sit differently in that system. That is a commonly described mechanism, not a measurement of any particular oil — CSI publishes no burn data for its vanillas or any other oil — and it is why the answer to the title question is no: do not assume identical wick behaviour; confirm it.

The bottom row is the one that answers the title. Even a supplier who has burn-tested the oil has done it in their wax, their jar and their wick. Their result is useful background; it is not your approval. The supplier-change post shows how far each kind of evidence reaches, and the same-name reformulation post covers the opposite case — an oil that keeps its name but changes underneath.

What we will and won't claim about our own vanillas

CSI lists two plain vanillas: Dark Vanilla Fragrance Oil and Vanilla Bean Fragrance Oil. On the 24 September 2026 pull their price ladders are identical: ₹130.00 for 15 g, ₹410.00 for 50 g, ₹790.00 for 100 g, ₹3,840.00 for 500 g and ₹7,646.00 for 1 kg. That is exactly the kind of coincidence that invites a "direct replacement" assumption — same family, same price, same shop. We do not make that claim between our own two vanillas, and we do not make it about either one against another supplier's vanilla.

The reason is simple. We do not publish burn-test results, throw measurements, composition, vanillin content or discolouration data for any oil. So we cannot tell you that one of our vanillas will run the same wick as your old one, and we will not pretend to. What we can do is sell you the smallest pack that answers the question, send the MSDS and IFRA documents on WhatsApp, and give you a test plan that makes your control candle the judge. The other vanilla-family oils in the range — Cinnamon Vanilla, Vanilla Orange Blossom, Dark Vanilla Oud, Coffee Vanilla Tobacco — are different scent concepts, not replacements for a plain vanilla.

The retest matrix when a supplier vouches for the oil

A supplier's claim can move a few lines from REPEAT to CONFIRM — if they tell you it is literally the same formula under a new code, the scent and storage lines deserve less suspicion. It cannot move any burn line to KEEP.

Notice that the wick rows are CONFIRM in both columns. The claim buys you nothing on the question in the title. It can make you more optimistic about the scent; the flame still has to be watched. Colour gets its own line because vanilla-family oils are the ones makers most often watch for darkening — the darkening-vanilla post sets up a controlled colour test, without assuming anything about any particular oil's chemistry.

The bracketed confirm: test the claim and the fallback at once

The plain confirm test from the hub is three new candles at your approved wick beside three controls. If the new vanilla fails a wick line, you then pour a second round with different wicks and wait another cure and another four cycles. When a supplier's claim is the main evidence you have, it can be worth running that second round at the same time: three extra new-oil candles one wick size smaller and three one size larger, in the same wick series you already use.

This does not break the one-variable rule, as long as you read the results in the right order. The comparison that answers the title is still new oil at the approved wick versus old oil at the approved wick — only the oil differs. The bracket candles are not compared with the control first; they are there so that, if the approved wick fails, you already know which direction fixes it. Never change the load at the same time; if throw is off as well as the flame, fix the flame first.

The bracket costs ₹1,222.60 more in a from-scratch kit, ₹520.00 of it in oil. Whether that is worth it depends on your deadline. With a festive order waiting, one saved round is worth far more than ₹1,222.60. With no deadline, the plain confirm is the cheaper honest answer.

Protocol, scoring and decision

The priced kit, and what to buy after it passes

Once the new vanilla passes, update your approved-material record with the oil's exact listed name, supplier, order date and pack, load, wick, wax and the test date — and note the supplier's claim alongside the evidence that confirmed it. Keep a retained sample of the lot you tested and two retained candles from the first production batch. The next time the supplier says "same as before", you will have something to compare against. The backup-supplier post turns this into a standing habit for every bestseller.

If the vanilla in question sits inside a blend rather than on its own, the claim matters even less, because the blend is its own system. The two-oil blend post and the 10% blend-change post show why a small component change can still reach the wick.

Frequently asked questions