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Steven O'Day 12-12-2017 01:34 PM

Copper ruby
Ran across this patent, they add a small amount of bismuth oxide to the formula. Anyone try this?

Manufacture of ruby glass

Pete VanderLaan 12-12-2017 01:49 PM

It's curious. Bismuth is really a heavy metal right there with lead. It also uses cyanide. It also wants to use stannic, not stannous oxide which is an opacifier and not a reducing agent.

Honestly, I think black tin will yield better results. Bismuth also is not cheap. If anyone tries it, let us know.

Jordan Kube 12-12-2017 04:00 PM

The boro melters use it, I think. There's some stuff to learn from what they are doing.

Pete VanderLaan 12-12-2017 04:59 PM

I think it's the zircon. Cyanide? no..

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