How to Test Whether Weak Hot Throw Comes From the Oil, Wax, Wick or Process

One variable at a time, and why a grid beats a queue

The usual way to isolate a cause is a queue: change the wick, wait 14 days; change the oil, wait 14 days; change the wax, wait again; then fix the process. Four rounds is 56 days, and each round is judged at a different time of year, in a different mood, often in a different room. Worse, a queue cannot see interactions: if your oil is only weak with the smaller wick, a queue that changed the wick first will call it a wick problem and a queue that changed the oil first will call it an oil problem, and both will be half right.

A factorial grid pours every combination at once. In stage 1, candles 1 and 2 differ only in the wick; 1 and 5 only in the oil; 1 and 3 only in the wax. There are twelve such one-variable pairs in the eight candles, and each factor's main effect is the average of four candles against four, which is much steadier than one candle against one. The rule of this series holds: every comparison changes one thing. The grid just makes many comparisons from the same pour, on the same day, judged at the same age.

Is it actually the fragrance oil?

The grid answers that question more fairly than anything short of it, because the oil is tested in eight settings, not one. If your oil is weak in all four of its stage-1 cells and the control oil throws in the same four settings, the oil is the problem. If the control is weak where yours is weak, the oil is cleared and a replacement would have failed too. If your oil is only weak with C1, the answer is a wick, not an oil. The simpler two-oil test in My Candle Smells Weak When Burning — Do I Need a Stronger Fragrance Oil? is a slice of this grid; the oil-or-process decision rule is in Should I Change Fragrance Oil or Fix My Candle-Making Process First?.

The twelve cells, one by one

All candles are 150 g at 8%: 12 g of oil and 138 g of wax, load on total weight. The load sits inside every ceiling involved: CSI 464 up to 10%, CSI 468 up to 13%, and both control oils' pages up to 10% for soy. "House wax" is whatever you pour now; if its page is silent on temperatures, follow your wax maker's stated temperatures. "Logged" means each wax at its own page figures, read on a thermometer and written down.

Why the process factor sits in stage 2. Crossing it with everything would double the grid to sixteen candles in stage 1. Putting it in its own small block, with the wick already settled and both oils present, gets you the process effect for four candles instead of eight, and gives you two repeat cells (10 and 12) to check that your logged process makes the same candle twice. "Your usual way" means exactly that: the spoon, the guess at temperature, the short stir, if that is what you normally do. The eight checkpoints worth logging are set out in My Formula Is Correct but Hot Throw Is Weak — Could My Process Be the Problem?.

Why CSI 468 as the second wax. Any second container wax with stated figures would do. CSI 468's page gives a pour temperature, a melting point and a load ceiling, so it can be run to spec, and its pour range (58°C–60°C) differs from CSI 464's (80°C–90°C) enough that "logged" is a real discipline. If you already pour CSI 468, use CSI 464 or Luxury Soy Wax Chunks as the second wax instead.

Control candles: what each one proves

There are three kinds of control in the grid, and each rescues a different wrong conclusion.

Choosing the control oil

A control oil need not be the best oil in the world. It must be consistent, easy to recognise blind, and run to its own page's spec inside your wax's ceiling. The cheapest control is an oil you already own that throws well in your system: it costs nothing and you know it. Otherwise we suggest Palo Santo, whose page states a soy load, a cure, a vanillin figure and a wick recommendation, or Gardenia if your suspect is a floral. The evidence standard for calling an oil weak against a control is in How Do I Know If My Fragrance Oil Is Too Weak for Candle Making?.

The protocol, day by day, and what it costs

Oil. Your oil: six candles, 72 g. Control: six candles, 72 g from a 100 g bottle, leaving 28 g for one rematch. Wax. House wax: eight candles, 1,104 g. CSI 468: four candles, 552 g, so the 1 kg, not the 500 g, which covers only three. Wicks. Four C1 and four C2 in stage 1, four of the winner in stage 2: one pack of 10 of each size is enough whichever wins. Jars. Twelve, which is more than a pack of 10.

With Gardenia as the control, new spend is ₹1,236.40. Figures exclude labour, freight, packaging and GST. For scale: a 1 kg of the control oil bought on the hope that "a stronger oil" will fix things is ₹6,018.00, 4.3 times the grid's new spend, and the grid might show that the oil was never the problem. Wash and reuse test jars; the jar line is the biggest part of the consumed value.

Reading the results table

Here is a worked example with invented scores, to show the arithmetic; they are not data, and your grid will differ. Scores are doorway scores at 1 hour on a 1 to 5 scale, each candle at its own day 14.

Interaction. With C1, both oils score 2: nothing can throw from a pool that does not reach the glass. With C2, the control scores 4 and yours 3. So in this example the oil question only exists once the wick is right, which a queue that tested the oil first, with C1, would have missed entirely. Stage 2. Suppose cells 9 and 11 (usual way) score 2 and 3, and cells 10 and 12 (logged) score 3 and 4: the process adds a point to both oils. Cells 10 and 12 match cells 2 and 6, so the logged process repeats.

What to buy for the grid

In the order the grid uses them: the wick factor, the second wax, then two control oils, of which you need one. The oils are chosen for the control role on stated basis only: a stated soy load inside CSI 464's 10% ceiling, a stated soy cure, a stated vanillin figure, distinct notes and stock at every size on 25 September 2026. CSI has not measured the throw of either. Candle counts assume 150 g at 8%.

Before Diwali: run stage 1 only

Diwali is 8 November 2026, 44 days after these prices were checked. The full grid takes about 23 days, and production candles need their own cure before dispatch, so the whole protocol does not fit comfortably. Stage 1 does: pour the eight candles by 1 October, score from day 14, 15 to 18 October, and pour production by 20 October with whatever stage 1 says, leaving at least a fortnight of cure before 8 November. Stage 1 alone answers oil, wax and wick; the process block can run after Diwali, ahead of Christmas and year-end gifting.

Stage 1 costs the same new spend as the full grid, ₹1,405.20, since the purchases are identical; it simply uses eight jars instead of twelve. Worked example for the production that follows: if C2 wins in your house wax (valued as CSI 464 at the 10 kg price), 41 candles need ₹7,128.31 of wax, jars and C2 wicks before oil, labour, freight, packaging and GST. Confirm dispatch for your city on WhatsApp before relying on these dates.

Frequently asked questions