"Cristallo is a glass which is totally clear (like rock crystal), without the slight yellow or greenish color originating from iron oxide impurities. This effect is ...
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achieved through small additions of manganese oxide. Often Cristallo has a low lime content which makes it prone to glass corrosion (otherwise known as glass disease).
The invention of Cristallo glass is attributed to Angelo Barovier around 1450." - (en.wikipedia.org 12.02.2022)
