1470-1550 [Definition of Process] Merge two or more layers of glass by heating and temperature soaking until the glass is fully combined [Process] 
Full Fusing
D r a p i n g
F i r e P o l i s h i n g
S l u m p i n g
T a c k f u s i n g
F u l l F u s i n g
F r i t C a s t i n g
P a t e d e V e r r e
C o m b i n g
G l a s s C a s t i n g