Understanding Candle Soot: What’s Normal and What Isn’t

Black soot around the rim of a candle jar is something many candle lovers will have seen at some point. While a small amount of soot can be completely normal, excessive soot is usually a sign that the candle isn’t burning as cleanly as it should.

At Harocsky Candle Co, creating a clean and even burn is incredibly important to us. Every fragrance, wick and vessel combination is carefully tested to achieve the best possible performance. Even small changes to fragrance oils or wick sizes can affect how a candle burns, which is why candle making involves far more testing and refinement than most people realise.

It’s also important to understand that a small amount of soot doesn’t automatically mean there’s something wrong with your candle. Candles are an open flame product, and even well-made candles can occasionally produce light soot depending on how they’re burned and the environment they’re in. A faint grey mark near the top of the jar from time to time is generally considered normal and is usually minimal when proper candle care is followed.

So what actually causes soot?

Soot is created through incomplete combustion — essentially when the candle flame isn’t burning the wax and fragrance oils as efficiently as it should. This produces tiny carbon particles that rise in the flame and can cling to the inside of the jar.

A number of things can increase soot production, even with a well-made candle:

• Burning your candle for too long
For the best performance, we recommend burning our candles for around 2–4 hours at a time. Burning for excessively long periods can cause the wick to mushroom, creating a larger flame and increased soot.

• Not trimming the wick
Before each burn, trim your wick to approximately 5mm. A wick that’s too long can create a taller flame, resulting in more smoke and soot marks.

• Drafts and airflow
Open windows, fans or air vents can cause the flame to flicker excessively, leading to an uneven burn and increased soot.

• Debris in the wax pool
Wick trimmings, dust or match debris left inside the candle can interfere with the flame and affect burn performance.

Because our candles are made using natural soy wax and carefully selected fragrance oils, burn conditions can slightly vary from home to home. Following the correct candle care guidance helps ensure the cleanest, safest and most enjoyable burn possible.

A properly cared-for candle should burn beautifully, evenly and with minimal soot — allowing you to fully enjoy both the fragrance and atmosphere it was designed to create.