Sublimation is a process where a solid turns into a gas without going through a liquid stage. In the context of mugs, sublimation refers to a printing technique where special ink is used to create designs on a substrate (like a white coral mug) by transferring the ink onto the surface using heat. White coral mugs are likely mugs made from a material resembling white coral, either in color or texture.

The sublimation process allows for intricate and vibrant designs to be transferred onto these mugs, resulting in a visually appealing and durable product.