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

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:

When first produced, this glass appeared perfectly clear.

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