I'm curious about the history behind annealing glass as electric kilns with digital pyrometers are recent inventions.
This piece of glass is from the 1st to 5th century A.D. Did the manufacturer understand annealing other than if he cooled the glass too slowly it would shatter?
I'm genuinely want to know. There are glass pieces hundreds and thousands of years old. Were they properly annealed as the term is now known?