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Candle making
All Containers›Shop by use case›Candle making›What goes wrong›MushroomingShop all candles →
What goes wrong

Mushrooming

By Dwight Davis, Founder

Updated

On this page5

A carbon ball on the wick tip: cosmetically ugly, functionally worse, and a reliable sign the system is over-fueled.

The ball on the tip

Carbon that has not burned, accumulating where the flame meets the wick.

It grows over a burn and it can glow, drop into the melt pool and float there, which is what customers report as "bits in my candle".

Why it happens

The wick is drawing more fuel than the flame burns cleanly. Excess carbon has to go somewhere and the tip is where it collects.

Three usual causes: a wick too large, a fragrance load too high, or a heavy dye load.

Wick construction matters too. Flat braid curls and self-trims; cored wicks stand straight and accumulate more.

Why it compounds

The ball increases the effective wick size, which increases fuel draw, which makes the flame taller, which produces more carbon.

So a candle with a mild mushroom at one hour has a serious one at four, and the flame at four hours is not the flame you tested if you only watched the first cycle.

It is the clearest argument for running the full four-hour cycle rather than a quick look.

Fixing it

Drop a wick size, or change to a self-trimming construction.

Reduce the fragrance load a point and retest.

Reduce the dye, or go undyed, which removes a variable entirely.

A small mushroom that self-trims is acceptable. A ball that has to be picked off is a candle that is not finished being developed.

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.