At MDG they did have pots of amber glass melted, the effects will be from silver chloride and the amber glass reacting with it, in the heat. He does achieve some lovely slightly jig-saw-y effects in the cloudy stuff.
![Smiley :)](http://www.glassmessages.com/Smileys/classic/smiley.gif)
(Although I cannot swear it would be silver chloride used with Amber - it might be they used silver nitrate, it is still the silver that is the important molecule for the colour.)
(So an amber casing would indicate MDG, not Mdina.)
In Earthtones pieces, the brown glass is achieved with the use of silver nitrate reacting with
red glass - so you do often see lovely streaks of reds in the brown strapping when Boffo made Earthtones - as well as it being in his typical grid-style of pattern.
Merise, that's the word.
![Wink ;)](http://www.glassmessages.com/Smileys/classic/wink.gif)
But it's not a seperate disc of glass, just a shaped stem.
John's right, the market for MDG does seen to be small.
![Grin ;D](http://www.glassmessages.com/Smileys/classic/grin.gif)
I'm grabbing all the green stuff I need before "the market"
realises what's going on and the prices start to rise.
It's a fascinating little niche area of Vincente Boffo's last work, combined with the influence of the emerging Studio Glass Movement in Europe.