Sublimation ink is a special type of ink used primarily for printing on materials that can be transformed into a gas when heated, such as polyester fabrics and certain coated surfaces. When heated, the ink turns into gas and bonds with the material, creating vibrant and durable images that are resistant to fading. This ink is commonly used in the printing industry for products like t-shirts, mugs, and banners. The sublimation process allows for high-quality prints with a wide range of colors, making it a popular choice for custom designs and promotional items.