Interview with the Ministry of Labor and Social Policies:
Almost 4 thousand years ago, the ancient Egyptians were the first to work glass with the intention of creating containers useful for everyday life. Even today, glass blowers and modelers are real master craftsmen, artists able to skillfully work the natural raw material, deriving from simple quartz sand. Only in the 1600s did man learn to work crystal, or glass, in the place of which calcium is artificially added lead oxide.
