Amethyst: Colored
SCA glass is a critical diagnostic tool for cultural resource assessments and archaeological surveys.
When first produced, this glass appeared perfectly clear. Colored Amethyst
Found in the ruins of late-Victorian and early-20th-century structures. SCA glass is a critical diagnostic tool for
Beverage and medicine bottles are the most common finds. Tableware: Pressed glass dishes and decorative items. Beverage and medicine bottles are the most common finds
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
💡 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
Manufacturers added manganese oxide to "mask" the natural green or aqua tint caused by iron impurities in the sand used for glassmaking.