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Steven O'Day
12-12-2017, 02:34 PM
Ran across this patent, they add a small amount of bismuth oxide to the formula. Anyone try this?

Manufacture of ruby glass (https://www.google.com/patents/US2233343)

Pete VanderLaan
12-12-2017, 02:49 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, 05:00 PM
The boro melters use it, I think. There's some stuff to learn from what they are doing.

Pete VanderLaan
12-12-2017, 05:59 PM
I think it's the zircon. Cyanide? no..