Fragrance load is the proportion of fragrance oil in a candle formula; scent throw is the perceived fragrance released by the finished candle. They are related, but raising the percentage does not automatically create a stronger or safer candle. Wax, wick, vessel, fragrance and cure conditions must be tested as one system.
Calculate load with one declared convention
Suppliers do not always express percentages against the same base. State whether the fragrance percentage is calculated against wax weight or total batch weight and use that convention in every trial. Record actual weighed amounts, not only the target percentage, so a failed batch can be reconstructed.
Cold throw and hot throw answer different questions
Cold throw is the scent perceived from an unlit candle. Hot throw is the distribution perceived while the candle burns in a defined room. Score them separately after a controlled cure period. A strong cold sample may perform poorly when heated, while an excellent hot throw may require time before it becomes representative.
Why more fragrance can reduce performance
Excess oil may change wax structure, create surface defects, affect wick behaviour or remain poorly incorporated. It can also increase soot or produce an unstable flame in an unsuitable system. The usable range depends on the wax supplier's guidance, the fragrance, the wick and applicable safety assessment—not a universal internet percentage.
Run a controlled test matrix
| Variable | Hold constant | Record |
|---|---|---|
| Fragrance load | Wax, wick and vessel | Surface, cold throw, flame and hot throw |
| Wick size | Formula and vessel | Melt pool, flame height, soot and vessel heat |
| Cure time | Finished candle | Evaluation date and room conditions |
Release only after a full burn programme
Test multiple units from the intended production method through repeated burn cycles. Record flame behaviour, melt-pool development, wick condition, visible smoke, vessel temperature observations and remaining wax. Include packaging and warning-label review. The approved formula is the complete combination of material codes and process settings; changing the fragrance, wick, dye, vessel or fill weight reopens the relevant tests.