Did you know?
Most commercial glass has a great deal of gas dissolved in it. If you heat it up to the right temperature, you can watch the gases bubble out of the glass like the carbonation in a soft drink.
Defect of the Month
March 2010
An alpha alumina (Corundum) stone viewed in polarized light. It is typically the product of recrystallized bonded alumina or alumina silica refractories.