Further to my comments here in this thread (see link)http://www.glassmessages.com/index.php/topic,51272.msg292956.html#msg292956
I went up to the V&A last week to look at the Franz Zach bowl - ooh it's really gorgeous.
I also took some pictures. It's the same technique as my vase, i.e. cameo, however it's only one blue layer over clear glass and the blue has been etched/carved away thinner in some areas thicker in others, as I said before, and that way it shows more or less light through giving the design on the bowl a very three dimensional feel - it's beautiful. Mine uses the white overlay behind the blue to give the paler and darker effect rather than light shining through ... if you see what I mean?
But what I could not see in the link pics was that looking at the bowl side on, the background clear just looks acid etched plain glass. However when you get the light behind it you can see vermicular engraving all over the background clear glass - it's stunning.
It's not quite as big as I imagined, so by comparison my vase/decanter feels like a fairly ok sized piece of work, especially considering how tiny (cabinet sized) many hand carved pieces of cameo glass are
I hope I'm ok to post these pics - they are mine and I was allowed to take pictures in there.