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Old 08-15-2020, 04:27 AM
Sean Jones Sean Jones is offline
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Surface metallic copper

I made a nice turquoise with copper in my wire melter but got a reddish film on the outside of the vessels. Itís only obvious where Iíve gathered over an opal but it looks terrible.
I can only assume itís metallic copper reduced by blocking. Is this a common problem or just poor blocking technique?
I had 42g of red copper oxide in 25kg of critalica (5.4g per 7lb). Made the blocks out of local cherry wood.
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Old 08-15-2020, 10:54 AM
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Pete VanderLaan Pete VanderLaan is offline
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I would suggest you use black copper instead of red copper. You could also consider adding a small amount of either potassium or sodium nitrate , probably the same number of grams that you are using of the red copper. Oxygen will tend to discourage the plating you are experiencing.

It's Cristalica.
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