Black coating uses either ruthenium or TIN cobalt black to give a piece of jewelry a light black or completely black appearance. It is very durable and resistant to scratches. Black plating gives the jewelry piece a sense of masculinity and high-tech.
Epoxy is a tough and resistant thermosetting synthetic resin that contains epoxy groups. It is strongly resistant to corrosive chemical heat, and ultraviolet light, and is widely used as surface coatings, laminates, and adhesives.