CorningWare

In 1953 S. Donald Stookey of the Corning Research and Development Division discovered Pyroceram, a white glass-ceramic material capable of withstanding a thermal shock (sudden temperature change) of up to 450 °C (840 °F), by accident. He was working with photosensitive glass and placed a piece into a furnace planning on heating it to 600 degrees Fahrenheit. When he checked on his sample the furnace was at 900 degrees and the glass had turned milky white. He reached into the furnace with tongs to discard the sample and it slipped and hit the floor without shattering.

CorningWare

In 1953 S. Donald Stookey of the Corning Research and Development Division discovered Pyroceram, a white glass-ceramic material capable of withstanding a thermal shock (sudden temperature change) of up to 450 °C (840 °F), by accident. He was working with photosensitive glass and placed a piece into a furnace planning on heating it to 600 degrees Fahrenheit. When he checked on his sample the furnace was at 900 degrees and the glass had turned milky white. He reached into the furnace with tongs to discard the sample and it slipped and hit the floor without shattering.