Final answer:
Enamel is a form of colored glass in powdered form that is fired and bonded to a metal surface, creating a durable and decorative finish often seen in jewelry and metalwork.
Step-by-step explanation:
The substance referred to in the question is likely enamel, which is a type of colored glass that can be powdered and then bonded to a metal surface. The process of attaching the enamel to metal involves firing, which melts the enamel and allows it to adhere to the surface, creating a durable and often colorful finish. This technique is used in various art forms, including jewelry making and decorative arts. Historically, enamel has been used to create intricate designs on pieces of metalwork, providing a glossy, glass-like appearance that is both visually appealing and resistant to wear.