Thread: Color bubbles
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Old 11-02-2017, 11:34 AM
Marc Carmen Marc Carmen is offline
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Join Date: Jul 2015
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Marc Carmen is on a distinguished road
Josh, I'm dying to try the durissimo. If it's a similar formula to Nero duro then it's a lead free iron sulfide black. Iron sulfide glass is not only naturally stiff but also incredibly brittle. Old glass container literature mentions that it is a cheap and easy way to black glass, if only it didn't make such an impractically brittle bottle.

Man, I have sooo many bubbly black filigrana in my student work haha.
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