I Want to Use the Same 9 cm Jar for Six Fragrances — Can Some Scents Use a Single Wick While Others Require Double Wicking?

Which oils earn a pair, and on what evidence

Before there is a production plan, each of the six oils needs a build it has actually passed on. The screening method for several oils in one jar belongs to other posts (a same-wick screen in the four-oils-in-one-7 cm-jar post, the two-oil, two-build 2×2 in the lavender and vanilla 9 cm post); this page starts where they finish. The rule we use to assign builds is simple and labelled as judgement: pour each oil on both builds; if the single passes the edge check at burn 3 and the heat check at halfway, it gets the single; if only the pair passes, it gets the pair; if neither passes, it doesn't join the range yet.

Why prefer the single when both pass? One wick is one position to get right, one flame to trim and one fewer way for a customer's candle to drift. Where the single passes, the pair adds nothing but a hotter, faster pool. In a jar measured 9 cm outside (8.3 cm inside on our assumed 0.35 cm wall), the single wick serves the whole 54.11 cm² pool and each wick of a pair about 27.05 cm²; which of those an oil needs is exactly what the test settles.

The pattern in the example follows a common tendency: the three oils with vanilla, amber or oud in their stated notes are the ones that failed on the single, and heavier, vanillin-rich or resinous oils are commonly the ones that need a wick change. Tendency is not assignment. Plenty of makers find a vanilla that behaves on a single and a floral that doesn't. The page wording in the table is there to show you what each page says, not to predict your result.

Two builds, one bench: the pour-line controls

Once each oil has its build, treat the range as two production lines that share a jar. The worst case is not a slightly different candle; it is a Cinnamon Vanilla jar poured onto a single Cotton Braided, the very build it failed on, lidded and shipped. These six controls are designed to make that impossible, or at least visible before the lid goes on.

The tab count and the wick reconciliation are the two controls that catch what eyes miss. They work because the arithmetic is fixed: 60 single-build jars take 60 tabs; 60 pair-build jars take 120. If you start the single-build days with 70 Cotton Braided and end them with anything other than 10, a jar has the wrong wick or a wick went in the bin; either way you check every tray before lidding.

A note on pour temperature: CSI 464's page states "Pour Temperature 80°C – 90°C". Your 9 cm jar is not a CSI listing and states nothing we can see, so pour at the low end and pre-warm clean jars (our judgement), identically for both sessions. Changing the pour temperature between builds would add a second difference between the two lines.

How many holders, and which holes

A holder stays on the jar until the wax has set enough to hold the wick, so the number you need is the number of jars in one pour session. In the worked example a session is 20 jars, one oil at a time across four trays of five, so 3 sessions per build and 20 holders on the bench. Pour the two builds on different days and those same 20 holders serve both.

The Steel Wick Holder suits a mixed range because one part does both jobs: its page describes a "3-hole layout fits single, double, or triple wick setups" for jars "up to 9 cm wide". The centre hole takes the single; the two outer holes take the pair. Two checks before you commit: the page states no hole spacing, so measure the outer holes against the spacing your pair was tested at (4.15 cm, which puts each wick about 2.1 cm from the wall along the line in the worked example); and a 9 cm jar is at the top of the holder's stated range, so confirm it rests securely on your rim. If the outer holes don't match, the pair needs its own holder: a flat stick with two pegs at your measured spacing.

Rupees per candle, build by build

Per 300 g candle at 8%, each candle is 24 g of oil, 276 g of CSI 464 (₹140.04 at the 10 kg price) and its wick build. Oil is costed at the 500 g price, the size a 20-candle batch needs. Jars are excluded because CSI lists no 9 cm jar.

Read the columns, not the rows. The wick column moves by ₹0.20; the oil column moves by ₹68.40 between Citrus Lemon and Dark Vanilla Oud, about 342 times as much. On averages, a pair-build candle here costs ₹277.67 and a single-build candle ₹226.68, a gap of ₹50.98, and that gap comes from the three pair-build oils being dearer per gram, not from the wicks. So set prices by oil. If a buyer asks why the vanilla-oud candle costs more, the honest reason is the oil.

That is ₹275.11 per candle in cash, including the leftovers and the reusable holders; the materials actually consumed come to ₹30,260.93, or ₹252.17 per candle on average. Every oil bottle has 20 g left after its twenty candles, enough for the retained sample most makers keep. All figures exclude labour, freight, packaging, GST and your jars.

When builds get mixed, and how you would know

The second row deserves a word. A single-build oil on the pair is not dangerous by default, but it is untested: a pair on an oil that already passed on one wick commonly runs a deeper, hotter pool than it needs, and the final third is where that shows. Treat any candle on a build its oil was not tested on as a test candle, not stock.

If a mix-up does reach customers, the useful record is the batch sheet: which session, which tray, which pitcher. For late-life complaints from a batch, the diagnosis lives in the 32xx posts, such as the second-half problems catalogue; the job here is to make sure it never starts.

When one build for all six is the better plan

Running two builds is worth it when the oils genuinely split. It is not worth it when one build passes all six and the other merely looks tidier for some. If your screen shows the pair passing every oil and the single passing only three, a single-build line for three oils buys you a slightly simpler wick on half the range and doubles your pour-line controls. Some makers accept that; others standardise on the pair. The standardisation question, grouping oils by family, is the family-standardisation post, and cutting the range to fewer builds and SKUs is the SKU-reduction post.

A new, seventh oil follows the same route as the first six: both builds on the bench, the simpler passing build wins, and it gets a line on the build sheet before it gets a tray. Tempting as it is to drop a "light" new oil onto the single line, the build sheet is only as good as the tests behind every line.

What to buy, and what to skip

Five items for running the split, chosen on page statements, price and stock on 29 September 2026. CSI publishes no wick-performance data, so nothing is ranked on burn results; the builds are the worked example's. Oil candles are counted at 24 g (300 g fill) and 12 g (150 g).

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