Why is there a black residue forming around the rim of my candle jar?Updated a year ago

Even on our beautiful dark glass, you may notice a black residue. This is because a candle wick requires trimming between burns or if the candle has been burning continuously for two or more hours. The wicks should be trimmed to about 7mm from the wax, only then will the candle stop emitting carbon - the black residue. If there is black residue on the glass of your candle jar, use a dry piece of paper towel and wipe clean.