Frosting

Updated October 2026

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White crystals on the surface Why soy does it What reduces it It is a sign of the thing you advertise References

A white crystalline bloom on the surface of a natural wax candle, and the second great cosmetic complaint of the category.

White crystals on the surface

A frost-like pattern on the top and sometimes on the sides against the glass. It develops over days or weeks and is more visible on dyed candles, where it looks like the color is fading.

Why soy does it

Soy wax is polymorphic: it can crystallize in more than one form, and over time it moves towards the most stable one. Frosting is that transition happening at the surface.

Which means it is not a defect in the sense of something having gone wrong. It is the material doing what the material does.

Temperature changes accelerate it, which is why a candle that was smooth in the workshop frosts on a shop shelf.

What reduces it

Slow, even cooling.

Pouring at the lower end of the range.

Less dye, or none. Frosting on an undyed candle is barely visible.

A blended wax with additives intended to suppress it, which is what most commercial "soy blend" waxes are doing.

Storage at a stable temperature.

It is a sign of the thing you advertise

Paraffin does not frost. If you are selling natural wax, frosting is evidence of exactly that, and the strongest response is to say so on the care card rather than to apologize for it.

Makers who fight frosting hardest usually end up in a blend with additives, which is a legitimate choice and worth making deliberately rather than by accident.

References

No published source. This page is written from practice rather than from published guidance. No extension service or agency publishes on this question for candles, so nothing here is cited, and it should be weighed as experience and not as a standard.

Written from the federal regulation, the CPSC material and the published scope of the ASTM candle standards. The standards themselves are copyrighted documents that must be bought; what is described here is their scope and requirements as published, not their text. Your own burn testing against your own vessel and wick is what establishes whether a candle you made is safe.