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Iron in sand gives the glass a range of colors from light green to dark amber, depending on the amount of iron in the sand.
If you truly just love this purple, why not buy glass made in the color rather than promoting the turning of American historical glass purple? It depends on what the meaning of "old" is and what the glass formula is.
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In order to make the glass sparkling clear, manganese oxide was added, so it depended on the skill of the individual glass master as to the amount of manganese that was added to the mix.
This could vary with each manufacturer and from batch to batch.