Candle jars are used to develop micro organism requiring an accelerated CO2 concentration (capnophiles). Candle jars boom CO2 concentrations and nevertheless go away a few O2 for cardio capnophiles. Glass is an excellent fabric for a candle box because of its non-flammable and non-porous properties. The thicker the glass, the much less probably it's miles to crack. Glassware, inclusive of canning or jelly jars, tea cups and different warmness secure substances are famous merchandise frequently utilized in candle-making.