Corelle dishes are made of Vitrelle, a tempered glass product consisting of two types of glass laminated into three layers. The outer layers are clear glass, while the inner layer is opaque white. For those items with colored decoration, the decoration is a glassy ink applied on the outside of the three-layered item. The resulting tableware is strong, lightweight, and designed to inhibit breakage. Corelle is best known for its three-layered glass, but the product line also includes items made of other materials, such as stoneware and plastic. The ink used to create the patterns is a glassy ink, and it is fused onto the skin glass, making it possible to feel the pattern. Corelle dishes are microwave- and dishwasher-safe, and they are easy to clean and maintain their cleanliness and hygiene without the smell of food odors.