Why Do Motor Magnets Come in Black And White?

Material selection and surface treatment.
1. Material selection: Motor magnets are made from different materials, such as ceramic or metal. Different materials have different color characteristics. For example, black ceramic or ferromagnetic materials can cause magnets to appear black.
2. Surface treatment: Surface treatment during the manufacturing process can cause magnets to appear black or white. For example, coating with specific chemicals or performing an oxidation treatment can change the surface color of magnets.