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Old 03-06-2019, 06:24 PM
Jacob Willcox Jacob Willcox is offline
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Copper Blue Phosphate

Hello all, Im a student at Alfred and we have a class taught half by the glass faculty and half by engineering faculty. The main goal is to experiment with coloring glass. I spent the first semester doing 100 gram melts testing basic colors with spruce color base.

This semester Im looking into opals created by Stp and Bone ash. Friend of mine sent me over to this forum, and I really appreciate all the knowledge that is shared. So thank you to everyone! Especially Dave Bross, Jordan Kube, and Pete Vanderlaan. (sorry if i missed someone who also contributed to the phosphate discussions)

Here is my first test in the direction I was looking for. After more testing I hope to melt in our 50 lb crucible, but we can only send it up to 2275 F. Curious if there was anything I could try to lower the melting point of the stp. Would love to mix from scratch but using what is available at school.

Formula is
Melted at 1300 c
%91.5 Sp color base.
%.5 copper oxide
%4 Stp
%4 boric acid

I had to pick up the chunk and strike it before I overlayed it but found the color became more vibrant after annealing for the second time.
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Old 03-06-2019, 06:28 PM
Jacob Willcox Jacob Willcox is offline
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Heres a few pics after its been blown out.
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Old 03-06-2019, 08:10 PM
Jordan Kube Jordan Kube is offline
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Looks great, what's the problem?
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Old 03-07-2019, 07:13 AM
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Pete VanderLaan Pete VanderLaan is offline
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SP Color base does have a lot of calcium in it and it would be better to get it out and replace it with Strontium which can be had from Universal Pigment. As I recall, it has a similar expansion coefficient so it can fit reasonably. .5 copper is a lot of copper given the capacity of the metal to really change the working characteristics of the glass. Gets sloppy fast. Consider the base formula that Dave Bross put out. SP color base has it's limits.
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