Glossary
Wet spots
Patches where wax pulls slightly away from the inside of a glass container, usually from temperature changes.
Wet spots are patches where the wax pulls slightly away from the inside surface of a glass container, creating a cloudy or uneven patch that is most visible when the candle is held up to light. They are caused by the natural contraction of wax as it cools and by shifts in room or storage temperature after the candle has set.
Wet spots are a cosmetic issue rather than a performance problem, and a candle with wet spots burns the same as one without them. They matter mainly for how a candle looks on a shelf or in photographs, and clear glass containers show them far more readily than frosted, colored, or opaque vessels.
Consistent pour temperature, a stable room temperature during cooling, and avoiding sudden temperature swings after pouring can reduce how often wet spots appear, though they are difficult to eliminate completely with some wax and glass combinations. A common mistake is assuming wet spots always mean a lower quality wax, when container material and cooling conditions play just as large a role.