A plea for help! Sorry to be dense, but I can't see how this ashtray would be called sfumato. I thought the shading from one colour or shade to another was created by the addition or use of particles of a certain type of glass. I'm not sure I see how this would be achieved by bubbles, where it would pulegoso or bollicine. I can see the big bubbles in the ashtray, but am I failing to see smaller ones? I've also been looking through my bookmarks for a site that has an ashtray like this from Czechoslovakia, but I haven't found it---yet. Anita and Shannon, do you see the other pieces from this person being Murano, particularly the piece with the stretched bubbles?
David