I’m Testing a Wide Jar and One Wick Size Seems Slightly Too Small While the Next Is Clearly Too Large — Should I Test Another Wick Series Rather than Choosing Between the Two?

Why the step you want isn't on the shelf

Wick series are sold in steps. A finer-stepped series gives you more chances that one step fits your jar, wax, oil and load; a short range gives you fewer. CSI's range is short, and this page is where we say so plainly: the tabbed Eco wicks come as Thin (C1) and Thick (C2), then Cotton Braided Wicks Ready Made, whose page says "engineered for large-diameter candles exceeding 8 cm". There is no sized, tabbed wick between C1 and C2, and none between C2 and Cotton Braided. Two cut-to-length options (the Braided Wick Roll and Eco Braided Wicks) and one wooden wick complete the list, and none of their pages states a size.

So "slightly small then clearly too big" is a predictable result on a short ladder, especially in wide jars. In the worked example it is a 9 cm jar (8.3 cm inside on our assumed 0.35 cm wall, a 54.11 cm² pool): one Eco C2 leaves a thin ring that never quite closes, and one Cotton Braided runs a tall flame, mushrooms and pools deep by halfway. The oil is Japanese Cherry Blossom at 8% in CSI 464, 300 g (24 g of oil and 276 g of wax).

When a bracket has a documented fail on both sides, the bracket-closure post calls it closed. Here it is closed with no winner, which is a different situation: the answer lies in the gap, and the gap has to be approached with a different tool.

Stage 1: prove "slightly small" isn't method

"Slightly small" is a verdict often caused by the test rather than the wick. A 2-hour session in a jar that needs about 3.3 hours by the rough one-hour-per-2.5 cm rule, a wick left long and sooty, a ceiling fan, a wick 3 mm off centre: each of these can leave a thin ring that looks like a size problem. So stage 1 costs almost nothing and comes first.

Stage 1 uses 48 g of oil and 552 g of wax: ₹538.96 in materials, or ₹871.80 in cash if you are starting from nothing (a 50 g bottle of Japanese Cherry Blossom, a 1 kg bag of CSI 464 and a C2 10-pack). If the small rung passes, it goes on to the full-life test and you buy nothing else.

Eight ways to land between two rungs

The order matters. Option 1 is nearly free and often settles it. Options 2 and 5 change the construction while keeping cotton, and they are the pair we test in stage 2. Option 3, the fragrance load, is a nudge with side effects: Japanese Cherry Blossom's page states "6-13% for candles", but CSI 464's page says up to 10%, and the lower ceiling governs, so the lever runs from 6% to 10% on CSI's total-weight convention (9% if you read the wax ceiling on wax weight). A lower load on the small rung saves ₹30.00 of oil a candle and may let the flame burn a little more freely; a higher load on the big rung costs ₹30.00 more and may calm it. Both change throw, and both are tendencies, so they are labelled arms of their own. The load-versus-performance question in general belongs to the formulation series (the 8%-beats-10% post).

Option 4 is narrower than it looks. Fill height doesn't make a wick bigger or smaller, and the pool still meets the same diameter. What more headspace can change is the top of the candle's life: a flame near the rim, soot on the lid. If the big rung's only fault is there, a lower fill is worth one labelled arm; if its fault is heat at halfway, fill height is not the fix. A lower fill also changes your net weight and price.

What each option costs per candle

The chart above compares the wick cost per candle. Every candle in the worked example also carries ₹120.00 of oil and ₹140.04 of wax (₹260.04 together), so a three-candle arm costs:

Two things follow. The wick is a small share of any arm, except the wooden one; the oil and wax make up most of the cost of a test. And the braided roll's low per-wick figure is only true at scale: to test three wicks you buy the whole roll, and ₹685.62 of it sits on the shelf unless that series passes.

Stage 2: the in-between round

If stage 1 confirms the small rung is small, pour six candles from one batch: three on two Eco C1 at a measured spacing (the cluster's labelled starting point is 4.15 cm, the inside radius; each wick then serves about 27.05 cm²) and three on a braided-roll wick cut to your jar. Your stage-1 C2 candles are the control. CSI 464's page states "Pour Temperature 80°C – 90°C"; your 9 cm jar isn't a CSI listing, so pour at the low end and pre-warm clean jars (our judgement). The Japanese Cherry Blossom page states no cure time in the text we captured; the 25 of 102 CSI oil pages that do say 48–72 hours for soy, and many makers wait about a week.

Stage 2 materials used come to ₹1,616.86; the cash outlay for stage 2 is ₹2,609.62 with the roll or ₹1,902.80 without it. Costs are worked examples and exclude labour, freight, packaging, GST and your jars.

"Halfway" means by weight, not by eye: tare the jar before pouring and read the zone when about half the fill is left. The scorecard for reading a candidate at burn 3 and at halfway is the two-zone post; the same pass lines apply here.

When the right answer is another series

If stage 1 confirms the gap and neither stage-2 construction fills it, you have learned something real: your candle needs a wick that CSI's short range doesn't list. At that point a series with finer, numbered steps in one construction, from another supplier, is the sensible next test. Bracket it the same way: a documented fail on each side and a candidate between, judged at burn 3, halfway and full life.

Before you change series, change nothing else: same wax lot, oil, load, fill, jar batch and room. A new series tested in a new wax is two changes, and you will not be able to tell which one fixed the candle.

What to buy, and what to skip

Five items for stage 2, chosen on page statements, price and stock on 29 September 2026. CSI publishes no wick-performance data, so nothing is ranked on burn results. Oil candles are counted at 24 g (300 g fill) and 12 g (150 g).

Frequently asked questions