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 achieved through small additions of manganese oxide.R. W. Douglas: A history of glassmaking, G T Foulis & Co Ltd, Henley-on-Thames, 1972, ISBN 0854291172. 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… (More on Cristallo)