red copper stain

[Peter Angel]

Hello all,

I recall a post some time ago about a copper stain that stains glass transparent red.

It wasn't an enamel or a glass paint. Instead, the glass itself changed colour - si milar to silver stain but rather than yellow glass it produced red glass.

I can't find this post.

Does anyone else remember this product?

Peter

[Don Burt]

Its this stuff from Debitus:

Characteristics of Red of Copper
--------------------------------------------------------------------------------
COMPOSITION :
Copper sulphide in red ochre
APPLICATION :
Distilled water ; the red ochre is removed after firing.Float glass is the most suitable for this product."
FIRING :
580°C or hotter , depending on the desired result.
ASPECT :
Light to dark red depending on the glass
Note : red of copper tints the glass; the light transmitted is coloured.

http://www.debitus.com/usa/grisailles.html

[Peter Angel]

Thats it!

Thanks Don.

[Tod]

I looked up copper sulphide and still am not sure how I'd find or make it.

See: http://en.wikipedia.org/wiki/Copper_sulphide

I know lots of folks don't trust Wiki but I wasn't sure where else to start. Is there a clue #2? Or maybe I just buy it all mixed? - Tod

[GuyKass]

For what it's worth you can get copper sulphate from a pottery supply house.

Will it do the same thing? I have no idea, but it seems like a logical starting point. The pottery place around here sells a pound for about 20 bucks, so not too big an investment.

It seems like the main difference between the two is that the sulphate has some oxygen built in.

See? Not worth much, but sort of interesting.

Guy