Colored Amethyst May 2026

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

Around the start of World War I, the supply of manganese (largely imported from Germany) was cut off. US manufacturers switched to selenium , which turns a straw or amber color when exposed to the sun, marking a distinct shift in the archaeological record. 3. Common Artifact Types Archaeologists frequently recover SCA in the form of: Colored Amethyst

Manufacturers added manganese oxide to "mask" the natural green or aqua tint caused by iron impurities in the sand used for glassmaking. SCA glass is a critical diagnostic tool for

When first produced, this glass appeared perfectly clear. this glass appeared perfectly clear.