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Copper patination question
Hello
I have been experimenting with different patination 'recipes' at home on copper using white vinegar and salt etc. But as well as a lovely blue/green, some of the copper surface turns a messy, powdery orange which rinses straight off when I put the piece in water. Does anyone on here have any hints as to what this powdery orange is ? I've done quite a bit of research on the stages of copper patinas, but nowhere mentions this stage. Thank you
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