All our functional pottery is intended for use. It is food-safe (glazes are lead-free) and may be used in a microwave or dishwasher. Our kitchen is filled with pottery that has endured many years of hard use. LightWave functional pottery is fired to 2250 degrees and is very durable. I make all my glazes and am continually doing glaze research to develop new ones. This is a slow process but also very rewarding. My glazes are unique, they exist nowhere else in the world.