I Increased Fragrance Oil From 8% to 10% but Hot Throw Didn't Improve — Why?

Five reasons more oil stopped helping

The general theory of why more oil is not always stronger is on its own page. Here we deal only with your case: a candle that was weak at 8%, was stepped to 10%, and did not move. Five things can cause that, and they often travel together.

1. You reached the ceiling

Two ceilings apply, and the lower one governs: the wax page's stated maximum and the oil page's. Luxury Soy Wax CSI 464 states up to 10%; Luxury Soy Wax Chunks and Premium Coconut Soy Wax CSI 468 up to 13%; other waxes do not state one in the text we hold. Most CSI oil pages that give a candle maximum give 10%. A few go higher: Japanese Cherry Blossom "6-13% for candles", Cinnamon Vanilla "Up to 13% load for candles", Autumn "7-11% for candles". In CSI 464 all three stop at 10%. At the ceiling you have used all the headroom the wax maker allows. These are formulation limits, not regulatory ones, and the ceiling is not the best-performing load; it is simply the most you should put in.

2. The wax is not holding the extra oil

Past what the wax binds, extra oil tends to sweat, pool, or leave a wet film, and oil sitting on the surface of a jar is not throwing from a hot pool. Look at the 10% candles after a week: oily beads, a greasy top, mottling, or oil in the lid. In an Indian summer, warm-cool cycling can make sweating worse. If you see these signs at 10% and not at 8%, the extra 2% is partly outside the wax. The fix is less oil, not more; sweating with weak throw is covered in depth in My Fragrance Oil Is Sweating Out of the Candle but the Hot Throw Is Still Weak — Am I Already Using Too Much?.

3. The wick did not change

You changed the fuel and kept the burner. A wick sized at 8% may be marginal at 10%, because more oil changes what the wick is drawing, and heavy or viscous oils (dense gourmand, resinous, vanilla-rich) often need a wick adjustment; both are tendencies to test, not rules. Symptoms: a smaller flame than before, mushrooming, or a pool that is slower to reach the glass at 10% than it was at 8%. How load and wick interact is on the load-and-wick page.

4. The melt pool did not change

This is the commonest reason, in our judgement. Hot throw is fragrance leaving the surface of a heated pool. If the pool stalls short of the glass at hour 4, the wax in the solid ring contributes nothing, at 8% or at 10%. Adding oil puts more fragrance into wax that is not melting. As commonly cited rules of thumb, not CSI data: a container candle's pool often reaches the glass within about 3 to 4 hours, a depth of roughly 0.5 to 1 cm is a common target, and a very rough guide is about one hour per 2.5 cm of jar width.

5. Diminishing returns, and your nose

Even in a candle whose pool, wick and wax are all fine, 10% is unlikely to smell 25% stronger than 8%. More oil does not raise throw in a straight line, and a nose judging a familiar scent in a familiar room is a poor instrument for small differences. If you compared the candles on different evenings, in different rooms or at different ages, a real but small gain may have been lost in the noise. Judge blind, same room, same age.

Which reason is yours? Read the candle

Burn one 10% candle and one 8% candle of the same age, on separate evenings, in the same closed room, and log the pool at hours 2, 3 and 4. Then read across. This is the "is it actually the fragrance oil?" check for this case: until the pool, the wick and the binding are cleared, the oil has not had a fair test at either load.

What the extra 2% cost you

A 150 g candle at 8% holds 12 g of oil; at 10%, 15 g. The 3 g difference is 25% more oil per candle, and it shrinks what a kilogram makes from 83 candles to 66, 17 fewer. What that costs depends on the oil. Figures use each oil's 1 kg price, the lowest or equal-lowest price per gram for all seven.

At the lower end of CSI's range, the step costs ₹8.50 a candle with Citrus Lemon, the lowest per gram at 1 kg of the oils whose pages state a candle load; at the upper end of this chart, ₹22.94 with Dark Vanilla. None of these figures include the other things a 10% candle can cost you: a wick that needs upgrading anyway, more sweating returns in summer, or a batch that pools and has to be remelted. If 10% had made the candle sell, the 2% would be an investment. If it smells like 8%, it is a leak.

Worked example for a festive run: 500 candles of Pumpkin Spice at 10% instead of 8% use 1,500 g more oil, ₹7,965.00 at the 1 kg price. That is more than one extra kilogram of oil (₹5,310.00) bought to change nothing, if your step-back shows 8% throws as well.

The three-candle step-back test

You already know 10% did not beat 8%. The step-back tells you why, with three candles and one variable per comparison. Candles A and B differ only in load; B and C differ only in wick. All are 150 g, poured on the same day from one wax melt in the same jar type, and judged at the same age.

Materials: 39 g of your oil, 411 g of wax, 3 jars and 3 wicks (two of your current size, one a size up). Valued as CSI 464 at ₹0.51 per gram (₹208.54), three 150 g clear jars at ₹94.40 each (₹283.20) and wicks at pack prices (₹21.24), the three candles consume ₹512.98, excluding your own oil. New spend is ₹94.40 if you own C1 wicks and need a C2 pack; with candle D and 50 g of Lavender as the control, new spend is ₹364.40 and consumption ₹751.64. All figures exclude labour, freight, packaging and GST. The control-oil method in full is on the hub page.

Where to spend the 2% instead

The money you save by going back to 8% can pay for the change that actually limits the candle. For 100 candles, the comparison is stark.

If the step-back points at the oil (C and B both weak with full, deep pools, and a control at 8% clearly stronger), then a replacement is justified, and you should test it at 8%, not 10%. The two oils on the cards below both state ranges that start at 6%, which suggests they are meant to work at moderate load; which structural features to look for in a moderate-load oil is covered in What Type of Fragrance Oil Gives Strong Hot Throw at 6–8%?, and whether a pricier "concentrated" oil at lower load is worth it in Should I Buy a More Concentrated Fragrance Oil Instead of Increasing Fragrance Load?. For the deeper case where 6%, 8% and 10% have all been tried and all failed, see I Increased My Fragrance Load From 6% to 8% to 10% but My Candle Is Still Weak — Should I Change the Fragrance Oil?.

What to buy

In the order the step-back usually points: a wick for jars the Eco range cannot fill, an additive for oil that is not binding, then two oils to test at 8% if the oil itself is convicted. The oils are chosen for a stated range that starts at 6%, a named base, every size in stock on 25 September 2026, and a spread of family (floral and spiced); not for any measured throw, which CSI does not have. If your jar is a standard 150 g size, start with Eco C2 wicks (₹94.40 for 10) before any of these.

Festive production at 8%

Diwali falls on 8 November 2026 and Christmas on 25 December 2026. If you were planning a festive run at 10% because 8% felt weak, the step-back takes 14 days; pour it this week and you will know by mid-October whether the run can go at 8% with a better wick. Every kilogram at 8% makes 83 candles instead of 66. Confirm dispatch times on WhatsApp before you promise a customer a date.

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