I’m Double-Wicking a 10 cm Soy Candle with 8% Fragrance — How Do I Choose the First Two Wick Sizes to Test Without Using a Single-Wick Chart Incorrectly?
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Why not just use a single-wick chart at 10 cm? Because using two of the 10 cm row's wick sizes each wick for twice the area it serves, and halving the diameter (the 5 cm row) sizes it for half. Only the D ÷ √2 row matches.
Is my jar 10 cm inside? If it is CSI's Apothecary, probably not: the page says "Diameter (outer rim): Approx. 10 cm". On a 0.35 cm wall (our assumption) the inside is 9.3 cm and the equivalent jar is 6.58 cm. Measure yours.
What does round 1 cost? Six 500 g candles at 8% Pumpkin Spice, three per arm: 240 g of oil, 2,760 g of wax, six jars, twelve wicks, ₹4,212.86 of materials, excluding labour, freight, packaging and GST.
- Straight answer: which two sizes first?
- Each wick is a single wick in a smaller jar
- Three ways to read a single-wick chart, and two of them wrong
- Why the equivalent jar is only a starting point
- Round 1: two pairs, three candles each
- Reading round 1
- What to buy, and what to skip
- Frequently asked questions
Each wick is a single wick in a smaller jar
Put two wicks on a line through the centre of a round jar and, by symmetry, each looks after one half of the surface. The question a wick has to answer is how much area it must melt, and for each wick of a pair that is half the pool. A single jar with half the area has a diameter smaller by a factor of √2 (about 1.41), because area goes with the square of the diameter. That gives a simple translation: equivalent single jar = D ÷ √2.
| Your jar measures (inside) | Whole pool | Each wick serves | Equivalent single jar | Nearest single-jar experience in this series |
|---|---|---|---|---|
| 10.0 cm (if your 10 cm is the inside) | 78.54 cm² | 39.27 cm² | 7.07 cm (39.27 cm²) | a 7 cm-inside single (38.48 cm²) |
| 9.3 cm (CSI's 10 cm listing on a 0.35 cm wall) | 67.93 cm² | 33.96 cm² | 6.58 cm (33.96 cm²) | a CSI 7 cm listing read as outer (31.17 cm²) |
| 9.0 cm (the same jar on a 0.5 cm wall) | 63.62 cm² | 31.81 cm² | 6.36 cm | between CSI's 6 and 7 cm listings |
That lands each wick of a 10 cm pair in the range this series covers in the 6–7 cm single-wick hub, where the honest CSI bracket is C1 against C2. It is why the first two arms here are two C1 and two C2, not one size from a 10 cm chart row. If you have already brought a single wick to full life in a CSI 7 cm jar in the same wax and oil, its rung is a sensible middle for your thinking, but not a substitute for testing it in pairs: the next two sections are the reasons.
Measure your inside first. CSI's 10 cm listing, the Apothecary Glass Candle Jar, states "Diameter (outer rim): Approx. 10 cm" and calls itself "thick-walled". Read as outer with a 0.35 cm wall (our series' assumption) the inside is 9.3 cm and each wick's equivalent jar is 6.58 cm, closer to a CSI 7 cm listing read as outer than to a true 7 cm. A thicker wall moves it lower again. The arms don't change, but your expectations should: on a smaller inside, the lower pair has a better chance.
Three ways to read a single-wick chart, and two of them wrong
CSI publishes no wick chart, and its C1 and C2 pages state no jar range in the text we captured, so this is about charts you may have from elsewhere, or habits from your own single-wick notes. A single-wick chart is built for one centred wick: the row for a diameter gives the wick that melts that whole pool from the middle. Used for a pair, they invite two opposite mistakes.
| Reading | Row used | Each wick sized for | Each wick serves | Ratio | What tends to happen |
|---|---|---|---|---|---|
| 1 · Full diameter, two of them | 9.3 cm | 67.93 cm² | 33.96 cm² | 2.0× | two wicks each big enough for the whole jar: deep pool, tall flames, hot glass at the line ends |
| 2 · Halve the diameter | 4.65 cm | 16.98 cm² | 33.96 cm² | 0.5× | two wicks sized for a jar half as wide: rings at the glass, especially at right angles to the wick line |
| 3 · Equivalent diameter | 6.58 cm | 33.96 cm² | 33.96 cm² | 1.0× | the right place to start; still only a starting point (next section) |
Reading 1 is the common one: "my jar is 10 cm, the chart says X for 10 cm, I'll use two of X." Each wick is now sized for the whole jar while serving half of it, 2.0 times the area. In practice that is the deep, hot centre and tall flames that sent you to double-wicking in the first place, now twice over. Reading 2 overcorrects: "each wick covers half the width, so use the 5 cm row." Half the diameter is a quarter of the area, so each wick is sized for 19.63 cm² in a 10 cm-inside jar against 39.27 cm² it serves. Reading 3 asks the area question and lands at 7.07 cm.
Why the equivalent jar is only a starting point
| Difference | What it does | What it means for the first two arms |
|---|---|---|
| Shape | The half is a D, not a circle: its farthest glass is 5.20 cm from its wick at the halfway spacing, against 3.29 cm in the equivalent jar (1.6×) | The right-angle points need more reach than the equivalent jar suggests; the upper pair must be in the test |
| Two flames, one pool | The flames heat each other and the strip between them; a pair commonly runs hotter overall than two separate single candles | The lower pair must be in the test too; the upper pair may run hot |
| No wall between the halves | The two pools merge, so heat moves across the middle | Read depth at the midpoint as well as beside each wick |
| Coarse rungs | CSI lists no sized, tabbed wick between C1 and C2 | If the answer is between the arms, it is between CSI's rungs; say so and ask |
The shape point is easy to miss. At the halfway spacing in a 9.3 cm inside (4.65 cm apart), each wick is 2.33 cm from the glass at its end of the wick line but 5.20 cm from the two points at right angles to it; in the equivalent 6.58 cm jar, nothing is more than 3.29 cm away. In a 10 cm inside at 5.0 cm spacing the same comparison is 5.59 cm against 3.54 cm. That is why a pair chosen purely by area can leave crescents of wax at right angles to the wick line, and why reading those crescents is the ring-shape post. The rule-of-thumb clock shows the same tension: one hour per 2.5 cm suggests about 2.6 hours for a 6.58 cm jar but 3.7 for the whole 9.3 cm, and your sessions must satisfy the jar, not the equivalent.
Round 1: two pairs, three candles each
Hold everything else: the same wax bag, oil and load on total weight, jar batch, 500 g fill, spacing, pour temperature, cure and room. The worked example pours the Apothecary 500 gm with CSI 464 and Pumpkin Spice at 8%: 500 g = 40 g of oil + 460 g of wax. Three candles per arm costs more than two at this size, but this round decides which pair every later 10 cm test is built on, and with only two arms a single odd candle would decide it.
| Item | Size bought | Used | Cost of what is used |
|---|---|---|---|
| Pumpkin Spice | 500 g, ₹2,950.00 (₹5.90/g) | 240 g (40 g × 6; 260 g left) | ₹1,416.00 |
| Luxury Soy Wax CSI 464 | 3 × 1 kg, ₹1,522.20 | 2,760 g (460 g × 6; 240 g left) | ₹1,400.42 |
| Apothecary Glass Candle Jar, 500 gm | 6 × ₹212.40 | 6 jars | ₹1,274.40 |
| Eco Candle Wicks, Thin (C1) | 20, ₹118.00 (10-pack out of stock) | 6 (14 spare) | ₹35.40 |
| Eco Candle Wicks, Thick (C2) | 20, ₹188.80 | 6 (14 spare) | ₹56.64 |
| Candle Wick Stickers | 40, ₹100.00 | 12 | ₹30.00 |
| Round 1, materials consumed | 6 candles | ₹4,212.86 |
Per candle, with stickers: ₹698.60 on the C1 pair and ₹705.68 on the C2 pair (₹236.00 of oil, ₹233.40 of wax, ₹212.40 of jar). The pair choice changes the cost by ₹7.08 a candle. Costs are worked examples and exclude labour, freight, packaging and GST. From nothing, the cash outlay is ₹6,153.40. If a cell splits 2–1, a three-candle round 2 on that arm uses 260 g of oil you already have and costs about ₹2,117.05 in materials on the C2 pair, which is why the C2 20-pack is in the list rather than the 10-pack.
Reading round 1
| 2 × C1 | 2 × C2 | Decision | Next |
|---|---|---|---|
| Passes | Passes, but runs hotter | The C1 pair: enough reach, less heat | Full life on the C1 pair |
| Rings at the glass | Passes, calm | The C2 pair is the candidate | Full life on the C2 pair; watch the final third |
| Passes | Passes, calm | Take the lower-heat pair unless its throw disappoints | Full life on C1; keep C2 documented |
| Rings at the glass | Passes, but hot (deep, tall, carbon) | The answer sits between CSI's rungs | Check spacing and session first; ask us; another supplier's in-between wick is a fair option |
| Rings | Rings | Under-powered, or the ring is the pair's geometry | Read the ring's shape before going bigger: the ring-shape map |
| Hot | Hot | This jar may not need two wicks at this fill and oil | A single wick is back in play: the one-hour step-down |
| 2–1 split in either arm | — | Not decided | Round 2: three more of that arm (6 candles' worth of oil is left) |
Thresholds are our judgement, chosen to be read with a ruler and a skewer; depth and flame ranges are commonly cited rules of thumb. Keep the standard identical across all six candles and all three burns. Whatever wins, approval waits for the full life: wide jars commonly change behaviour in the lower third, and the multi-wick life-cycle post covers tuning a pair for the whole candle.
Two results send you elsewhere in this cluster. Both pairs hot, with a full pool very early: the jar may not need two wicks at this fill, and the one-hour step-down puts a single wick back in the test. Both pairs ringing at right angles to the wick line: read the shape before buying bigger (4262). The overall single-or-pair starter for this jar is in the 10–12 cm hub, and if your jar is 11 cm, three wicks enter the comparison in the 11 cm post.
What to buy, and what to skip
Five items, in the order round 1 needs them, 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 40 g (500 g fill) and 12 g (150 g).
| Pack | Price | Per unit | What it covers here |
|---|---|---|---|
| Thin (C1) / 10 | ₹59.00 — Out of stock | ₹5.90 | Out of stock on 29 September 2026 |
| Thin (C1) / 20 | ₹118.00 | ₹5.90 | round 1 (6), round 2 if needed, 8 spare |
| Thin (C1) / 50 | ₹295.00 | ₹5.90 | the same per wick; production only after full life |
| Thin (C1) / 100 · 500 · 1000 | ₹590.00 · ₹2,950.00 · ₹5,900.00 | ₹5.90 | production |
| Pack | Price | Per unit | What it covers here |
|---|---|---|---|
| Thick (C2) / 10 | ₹94.40 | ₹9.44 | round 1 only, four spare: no round 2 |
| Thick (C2) / 20 | ₹188.80 | ₹9.44 | round 1 and a three-candle round 2 |
| Thick (C2) / 50 · 100 | ₹472.00 · ₹944.00 | ₹9.44 | production, after full life |
| Thick (C2) / 500 · 1000 | ₹4,720.00 · ₹9,440.00 | ₹9.44 | production |
| Size | Price | Per gram | 500 g candles (10 cm) at 8% | 150 g candles at 8% |
|---|---|---|---|---|
| 15 g | ₹106.20 | ₹7.08 | 0 | 1 |
| 50 g | ₹330.40 | ₹6.61 | 1 | 4 |
| 100 g | ₹590.00 | ₹5.90 | 2 | 8 |
| 500 g | ₹2,950.00 | ₹5.90 | 12 | 41 |
| 1 kg | ₹5,310.00 | ₹5.31 | 25 | 83 |
| Pack | Price | Per unit | What it covers here |
|---|---|---|---|
| 500 gm | ₹212.40 | ₹212.40 | six round-1 jars at a 500 g fill |
| 700 gm | ₹250.00 | ₹250.00 | same stated outline as the 500 gm; ask before buying |
| Pack | Price | Per unit | What it covers here |
|---|---|---|---|
| 500 g | ₹260.00 | ₹0.52 per g | one candle, not six |
| 1 kg | ₹507.40 | ₹0.51 per g | buy three: 2,760 g for round 1, 240 g left |
| 5 kg | ₹2,537.00 | ₹0.51 per g | no cheaper per gram than 1 kg |
| 10 kg | ₹5,074.00 | ₹0.51 per g | production, after full life |
CandleMakingSuppliesIndia sells the wicks, oil, jar and wax named here, and does not sell finished candles. This page still tells you that the C2 10-pack is enough if you skip round 2, that the 1 kg oil can wait, and that your answer may sit between our two wick sizes.
Every price was verified on CSI's live store on 29 September 2026. Stock was checked per size: the Eco C1 10-pack and the 100-sticker sheet are out of stock on that date and are flagged wherever they appear; every other size shown is in stock. Wick, jar, load and temperature wording is quoted from the product pages; where a page is silent in the text we captured, we say so.
The equivalent-diameter translation and the ratios are declared geometry; the 0.35 cm wall, the 500 g fill, the starting spacing and the decision thresholds are our judgement or worked examples; melt-pool times, depths and flame heights are commonly cited rules of thumb, not CSI data; CSI publishes no wick chart and no wick-performance data. For bulk pricing, GST invoicing, and MSDS and IFRA documentation on request, message us on WhatsApp at +91 7397976926.
Frequently asked questions
- I’m Using a 10 cm Wide Jar and One Large Cotton Wick Overheats the Centre — Should I Test Two Smaller Wicks Instead?
- My 10 cm Jar with Two Wicks Still Leaves Wax Around the Perimeter — Should I Increase Wick Size or Change Their Spacing?
- My 10 cm Double-Wick Candle Reaches a Full Melt Pool Within One Hour — Are Both Wicks Probably Too Large?
- My 10 cm Jar Takes Four Hours to Melt Close to the Edge but Has Clean Flames — Should I Increase the Wick Size or Continue the Full-Life Burn Test?
- I’m Using a 10 cm Jar with 10% Vanilla Fragrance and Both Wicks Mushroom Heavily — Should I Reduce Wick Size, Fragrance Load or Both in Separate Tests?
- My 10 cm Lavender Candle Burns Cleanly but Has Weak Hot Throw — Should I Change Fragrance Concentration Before Increasing Wick Power?
- I’m Using an 11 cm Jar with Two Wicks and Getting an Uneven Melt Pool — Should I Try Three Smaller Wicks Rather than Two Larger Ones?
- I’m Using Three Wicks in a 12 cm Jar with 8% Oud Fragrance — Should All Three Wicks Always Be Identical Sizes?
- My Multi-Wick Candle Performs Perfectly for the First Half but Becomes Extremely Hot Near the Bottom — How Can I Optimise the Wick System Across the Entire Candle Life?
Customer reviews: The six reviews at the top of this page are genuine, published Judge.me reviews left by CSI customers on the product pages named on each card — Eco Candle Wicks, Gilli Mitti (Patchouli), Luxury Soy Wax CSI 464 (Flakes Form) For Container Candles, Luxury Soy Wax Chunks for Jar / Container Candles. They are general product reviews, not assessments of the wick advice on this page. Names, star ratings, dates and products are as recorded by Judge.me and wording is unedited. "Verified buyer" appears only on reviews Judge.me recorded as verified — Renu, Subhankar Roy, Monika Deep, Thenirvaofficial, Jaya Sawlani, Sakshi Jain. Reviews below five stars are included as published, not filtered out.
Figures verified 29 September 2026, CSI live pricing: Eco Candle Wicks Thin (C1) 10 ₹59.00 (out of stock), 20 ₹118.00, 50 ₹295.00, 100 ₹590.00, 500 ₹2,950.00, 1,000 ₹5,900.00; Thick (C2) 10 ₹94.40, 20 ₹188.80, 50 ₹472.00, 100 ₹944.00, 500 ₹4,720.00, 1,000 ₹9,440.00; Pumpkin Spice 15 g ₹106.20 (₹7.08/g), 50 g ₹330.40 (₹6.61/g), 100 g ₹590.00 (₹5.90/g), 500 g ₹2,950.00 (₹5.90/g), 1 kg ₹5,310.00 (₹5.31/g); Apothecary Glass Candle Jar with Dome Lid 500 gm ₹212.40, 700 gm ₹250.00; Luxury Soy Wax CSI 464 500 g ₹260.00, 1 kg ₹507.40, 5 kg ₹2,537.00, 10 kg ₹5,074.00; Candle Wick Stickers 40 ₹100.00; Cotton Braided Wicks Ready Made 10 ₹120.00; Performance Wooden Wicks 10 ₹590.00; Steel Wick Holder (Set of 5) ₹250.00. Every other size listed is in stock on 29 September 2026. Per unit = price ÷ grams or units, two decimals.
Non-price figures: load is a percentage of total candle weight (500 g at 8% = 40 g oil + 460 g wax; the standard 150 g candle at 8% = 12 g). The 500 g fill is a worked example within the Apothecary page's stated "~500 g - 700 g". The 0.35 cm wall is an assumption; pool area = π r² on the inside radius; the equivalent diameter D ÷ √2 is geometry; the halfway spacing (centre to centre = inside radius) is a labelled starting point. Ceilings are as the pages state (CSI 464 up to 10%, pour 80–90°C; Pumpkin Spice 6–10% for candles): formulation limits, not regulatory ones. Melt-pool times (about 3–4 hours; about an hour per 2.5 cm), depth (about 0.5–1 cm) and flame height (about 2.5–5 cm) are commonly cited rules of thumb. The decision rule is editorial judgement. Costs exclude labour, freight, packaging and GST. Diwali 8 November 2026 and Christmas 25 December 2026 are calendar facts.