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The Corning Museum of Glass is temporarily closed as we do our part to limit the spread of COVID-19. All previously scheduled classes, events, and programs are cancelled until further notice.

All About Glass

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Cracking Off

As if glassblowing wasn't fast enough—it takes under three minutes to make a Roman bottle—cracking-off made the process even faster. This technique was well known by AD 20 or so, and cut the manufacturing time of simple tumblers in half.