Heating: Rely on 30 second intervals to heat up your stones in the microwave. Never go longer than 30 seconds at a time. For a conventional oven, place stones at 300 degrees for 15 minutes. Do a touch test to ensure the temperature is safe prior to handling.
Cooling: Place the stones in a plastic bag for protection and put them in the fridge for a minimum of a half an hour. Leave them in there for up to 60 minutes. If you prefer, place them in the freezer for 10 to 15 minutes. In order to avoid freezer burning your skin, avoid going below 40 degrees Fahrenheit.
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