Thank you for your great question, lovetoshop. The Rachael Ray® 3½-qt. Rectangle Casserole Baking Dish's durable stoneware construction features a bold color and distinctive flared edges.To clean your stoneware, wash with warm soapy water and a soft nylon brush; rinse and dry. We recommend using a mild dishwashing detergent. To prevent water spotting, rinse in warm water after washing and towel dry thoroughly. Stoneware is also safe for use in an automatic dishwasher, however hand washing is recommended. Do not allow stoneware to soak in water for long periods of time and make sure it is dried thoroughly after washing. We hope this information is helpful.