Internally decorated glass is fascinating whichever technique
Your Graal piece sounds beautiful. (Pics please?)
I'm very curious as to how my box lid was made. Some of it looks as though material was used to create the netted bubble effect of the face, but the lines around it look as though they were drawn on and inked somehow as with the eyes and other dark bubbles.
It was bought in Denmark (wonders quietly if Picasso ever went to Denmark
)
There does appear to be a slight difference in the way the pattern has been made in the Brierley vase and the way it's made in say the Orrefors pieces. But it might just be the way it presents rather than the technique being different.
m