Amethyst - Colored

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

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

SCA glass is a critical diagnostic tool for cultural resource assessments and archaeological surveys. This report examines glass, a specific type of

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 Sun-colored amethyst refers to glass that has turned

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.

When first produced, this glass appeared perfectly clear.