One person warned: "Candles are always to be trimmed down to 1/4 inch before each light. "Don't burn if there's less than an inch of wax in the jar. Put the lit on to smother the flames.
from soot produced from a burning candle 1. The soot, which was collected by placing either aluminium foil or a glass plate above a candle flame, appeared to be composed of micrometre-sized ...