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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.
Where are we going and why am I in this basket?
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