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DIY Brass Etching methods (safer etchants, waste, and disposal of)
2 votes

I have since found (and am still exploring), some resources: Etching Without Acid: Metal Salt Etching & Electro Etching Cupric chloride PCB etching Is the best PCB etchant in every kitchen My ...

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Test presence of oxygen > 1%
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1 votes

This should do it

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