Precautions for Use: Do not use in dishwashers, microwaves, ovens, and open flames. Hand wash with a soft sponge and mild detergent before use and dry thoroughly. Please avoid soaking. If the slate rubs with hard objects or rubbing against each other, it will become white, but if you lightly apply edible oil, it will become inconspicuous. May chip or break if exposed to a small impact. You can enjoy the appearance of chipped edges and peeling of natural materials.