- Glass Making in Roman Times
- Roman Wine: A Window on an Ancient Economy
- Roman Wine: Windows on a Lifestyle
- Fine Glassware in the Roman World
- Reuse of Images in the Art of Rogier van der Weyden
Juglet
4th century A.D.
Ht., 12.3 cm
Glass is not naturally colorless. Beach sand invariably contains black particles of iron oxides scattered through it. When fired in a usual, oxygen-rich environment (i.e., with the furnace in an oxidizing state), these impurities give the glass a natural aquablue to light green tinge. The typical amount of iron in beach sand is 0.3%: the intensity of the color increases as the amount of iron increases.