Colored Amethyst -

Manufacturers added manganese oxide to "mask" the natural green or aqua tint caused by iron impurities in the sand used for glassmaking.

When exposed to sunlight (UV radiation), the manganese undergoes a chemical change, shifting the glass from clear to various shades of amethyst or violet. 2. Archaeological Significance

Found in the ruins of late-Victorian and early-20th-century structures. Colored Amethyst

Beverage and medicine bottles are the most common finds. Tableware: Pressed glass dishes and decorative items.

The purplish hue is the result of a specific manufacturing process: Manufacturers added manganese oxide to "mask" the natural

This report examines glass, a specific type of historic artifact frequently used by archaeologists to date sites from the late 19th and early 20th centuries. Executive Summary

💡 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 The purplish hue is the result of a

When first produced, this glass appeared perfectly clear.