The Beautiful Sugar Skull Candles are made with 100% Soy Wax
Any container made out of glass or ceramic can crack, even those that are considered heat resistant, such as canning jars or glassware made specifically for candle making. Those are unsafe containers. So, the key to a safe container candle is supervision.
SO PLEASE WHEN USING MAKE SURE THERE IS SUPERVISION WHILE CANDLE IS BURNING .. DON'T BURN ANY CANDLE ANY LONGER THEN 1/ 2 HOURS AT A TIME .