Colored Amethyst May 2026

When first produced, this glass appeared perfectly clear.

Because manganese was the primary decolorizer used specifically from 1890 to 1920 , the presence of SCA shards helps researchers pinpoint the age of a historical site. Colored Amethyst

💡 If you find purple glass in a historical context, it likely dates to the turn of the 20th century and was originally crystal clear before being "sun-colored" by decades of exposure. APPENDIX E: CULTURAL RESOURCE ASSESSMENT When first produced, this glass appeared perfectly clear

Found in the ruins of late-Victorian and early-20th-century structures. When first produced