Originally Posted by jwebb
The exact composition of "Ceramic Shell" is considered proprietary, a closely guarded "trade secret", by the best foundries. That said, there are commercially
Barye cast his own bronzes in the mid 1800's in plaster molds, no doubt plaster and sand, it doesn't seem like rocket science when you figure they were casting huge bronze and cast-iron long before sophisticated equipment.
I have a book on 19th century iron casting that shows how those large- roughly 12-16' tall round, 3/4 round, or rectangular architectural Corinthian columns you see on old buildings on the ground floor were cast in one piece with inch thick walls- a lotta metal needing to fill a lotta mold fast! They did it in the 1860's factory production style.