Sublimation printing is a type of digital printing that uses heat to transfer dye onto materials such as fabric, paper or plastic. The dye is in the form of a solid ink, which is heated to a gas and then applied to the material, where it cools and solidifies into the desired image. Sublimation printing is often used for products such as t-shirts, mugs and phone cases. Because the dye is absorbed into the material, the image is highly durable and resistant to fading or peeling.