Artist Info: Allan Ditton Pottery from Atamont, NY is made of high fired stoneware that is food safe. Because each piece is handmade and designed, no two will look identical. The matte textured, terracotta colored glaze found on the rims and tops of all their pieces are water tight and food safe. These pieces are safe for the dishwasher and oeven, provided that you place them in a cool oven and heat them up to cooking tempurature along with the food and the oven at the same time. The dinnerware should not be placed in the microwave, however, the mugs and bowls are microwave safe.