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Thank you for this very useful 'recipe', it worked very well etching heavy (1.5mm) copper sheet using photocopy resist to create dog tags and other jewellery. My only addition to this instructable is- keep the coper flat when etching to get an even etch, I tried suspending a two sided piece in the solution, and although it worked fast, there was a tendency to leave heavy 'flow' marks on the surface- possibly something to do with the debris leaving the surface? Pieces left flat in the tank with some rocking agitation were fine.....I will check and see if there is an instructable on photocopy resist, and maybe add one?
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