Use sand under the candle. Don't use water.

I thought to share this tip since so many of the glass candle jars are bursting with the fire heat that was caught from Ms Lala's herbs. Water will boil along with your candle, when the glass candle heats up, not only the heat of the fire inside the candle gets intense, the heat from the water will also get the glass jar to heat up more. If you glass jar burst, you'll end up with hot boiling water plus glass shattered. Get sand for art from Michael's, put it under your glass candle. Please stop using water, it is not safe to mix with fire or heat that's why fire extinguisher does not contain water. Hope this helps.