Glass bottle in the form of a fish, Dynasty 18, from Amarna, now at the British Museum
Glass was introduced to Egypt in the New Kingdom, during the reign of Thutmosis III. Glass was usually opaque and made in many bright colors. It was somewhat valuable because it was hard to control the high temperatures that were required to work with glass, making it a difficult process. However, the ancient Egyptians became very skilled at working with glass. Examples of glass works include beads, functional vessels, and even decorations on coffins, as seen in the mummy mask of King Tutankhamun.