>> Glass making reached its peak at the beginning of the 2nd century AD, with glass objects in domestic contexts of every kind.[1] The primary production techniques of blowing, and to a lesser extent casting, remained in use for the rest of the Roman period, with changes in vessel types but little change in technology.[1] From the 2nd century onwards styles became increasingly regionalised
Fleming, S. J., 1999. Roman Glass; reflections on cultural change. Philadelphia, University of Pennsylvania Museum of Archaeology and Anthropology.

https://en.wikipedia.org/wiki/Roman_glass