Dishwasher-safe porcelain. In this decoration, the colors are fused into the glaze at over 1000°C. During this process, the glaze softens and the decoration sinks into the glaze. As a result, it becomes indestructible in color and brightness, and is scratch- and abrasion-resistant. However, gold decorations are not completely resistant to scratching due to the natural properties of the materials. This decoration has been tested by the Institute for Materials Technology (IWT). It can be safely cleaned in the dishwasher. Microwave-safe. This item can be used in the microwave without any concerns.