If the cup doesn t have any text printed on it check the box that it came in.
Ceramic cups in oven.
Ceramic includes earthenware bone china stoneware and porcelain.
Most mugs and dishes have a maker s mark that identifies the manufacturer.
Place the freshly painted mug in a cold oven.
Expect to see text that says dishwasher microwave and oven safe on any mug that you can put in the oven.
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Step 4 bake your mug for about 35 minutes or for the time indicated in the instructions on the paint packaging.
If the glaze on the ceramic bowl isn t waterproof then the porous clay beneath is unprotected.
Bake for 30 minutes.
Turn the oven onto bake at 360.
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This can make the bowl sensitive to the temperature changes that can occur when you put a cold or room temperature bowl inside a preheated oven.
Many coffee mug sets come with a small book of care instructions.
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Do not preheat the oven because the mug may crack or shatter if it does not gradually heat.
Preheat your oven to 300 degrees fahrenheit and set your mug on a cookie sheet for easy removal after baking.