Topic: Opalines

[aa]

Some interesting historical and technical information on opalines from Gaffer Glass in their newsletter here http://www.gafferglass.co.uk/newsletter.htm

[flying free]

thanks Adam that's very interesting.
It's made me feel a bit weird about my early 1700's milky opalescent Bohemian flask though.  I just assumed it was animal bones.  I hope it was
m

[chopin-liszt]

I know to be warned about contemoprary"chalcedony" - not nearly as impressive to achieve as it was.
thanks, Adam!