- 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
Heavily weathered "onyx" ware
Early 1st century A.D.
In certain deliberately colored glasses the progress towards disintegration moves quite rapidly. For example, during weathering of opaque red glass (see Coloration), the cuprous oxide needles that cause the coloration are easily converted to a green crust of copper chloride. During the weathering of "onyx" ware (see Mosaic/Cast), the creamy opaque white swirls become heavily pitted while the amber layers between them remain resistant.