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Black on the glass is soot. A tall, dancing flame is burning the wick faster than the air can take the carbon away, so it plates out on the nearest cold surface — your lid, your ceiling, the upper third of the jar.
Usual causes
- Wick not trimmed. The number one.
- Draught — hall door, extractor, an open window aimed at the flame.
- Wick too large for the jar (a making fault). Less common in a decent candle, common in cheap ones.
- Burning for six hours because you forgot it. The mushroom grows, then it smokes.
Fragrance oil does not “stain the jar black”. Neither does soy. People like a villain. It is the flame.
Stop it
Trim to 5mm. Move the candle. If it still soots on a still table with a short wick, the wick is wrong for that wax. Ours should not do that in normal use — if one does, tell us, send a photo of the flame, not just the glass.
Longer on trimming and draughts.
Clean it
When the wax is set and cold, wipe the glass with a drop of washing-up liquid on kitchen paper. For the inside, wait until you are finishing the candle, then hot water. Do not gouge a burning candle with a wet cloth.
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