Original Message:   Glass chemistry question

I read that the "natural" color of glass was typically a pale green due to iron oxide in the sand. Manganese dioxide was/is used to "de-colorize" the glass to make it clear, but I don't know if that was widely used in Venetian glass making 500 years ago. Is it possible that the slightly green translucent color in these old beads - as seen in the inner layer on a lot of 7Ls - was due to using "natural" glass that lacked the de-colorizer? And if the slightly green glass was colored further by adding cobalt oxide to get blue glass, a slightly green tinged blue was the result, rather than the more pure cobalt blue color we all know and love? Copyright 2024 All rights reserved by Bead Collector Network and its users

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