Amethyst: Colored

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

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

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

Sun-colored amethyst refers to glass that has turned a purplish tint due to prolonged exposure to ultraviolet (UV) light. This phenomenon is not natural to the glass's original state but is a chemical reaction involving manganese oxide, which was used as a decolorizer in glass production between approximately . 1. Chemical Composition & Origin

The purplish hue is the result of a specific manufacturing process: Found in the ruins of late-Victorian and early-20th-century

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

SCA glass is a critical diagnostic tool for cultural resource assessments and archaeological surveys. Tableware: Pressed glass dishes and decorative items

💡 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