This sink is made of a new type of melamine material, which has a food grade material. Do not use chemical coating techniques such as surface painting, and use food grade materials to form a zero coating water tank through one-time die casting. The dense structure makes it more color resistant than traditional water tanks, and it will not turn yellow after long-term use. The experiment selected stains that are difficult to clean for testing, and after 24 hours of high-temperature drying, they are still as white as new after cleaning.