Topic: Interesting effect on studio glass vase -- how is this made technically?

[rocco]

A question out of curiosity:

I recently bought this nice studio glass vase by Jindra Beranek.
The pink and purple blotches show an interesting effect: if light is reflected there is a neon green sheen to them, while when backlit there is not a hint of that...

I guess it is neither iridescence, nor Uranium, but how is this achieved?

Thanks!
Michael

[chopin-liszt]

Some bits of IoWSG "pink and blue swirls" do this sort of thing too - the pink can turn green, depending on whether the light if reflected off the glass or is coming through it.
I think it's because of refracted light, rather than reflected, but I also think it might depend on the exact chemical compositions used to obtain the colour - given some IoWSG "pink and blue swirls" bits do NOT do this.

[glassobsessed]

Is the effect here Dichromatic? http://en.wikipedia.org/wiki/Dichroism

John

[rocco]

Thanks a lot Sue and John!
Dichroic glass sound like a good explanation for this effect. (Never heard of it before)

Michael