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That would be a cullet with about 12 grams silver nitrate in 21 lbs of cullet plus 60 grams of black tin and about 20 grams of Ferrous oxide ( red iron). It may take more silver depending on the state of oxidation in the cullet.
It has the Fritz Dreisbach trade name of silver smaltz. Prinicipally it is the same as my silver opal. It is an ideal glass drawn from the pot as opposed to being used as rod. As a second gather cased again in clear works best.
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