Colored Amethyst May 2026

The purplish hue is the result of a specific manufacturing process:

SCA glass is a critical diagnostic tool for cultural resource assessments and archaeological surveys. Colored Amethyst

Manufacturers added manganese oxide to "mask" the natural green or aqua tint caused by iron impurities in the sand used for glassmaking. The purplish hue is the result of a

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 the manganese undergoes a chemical change