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Not the safest of chemicals but a simple fast etchent. Often used as a quick fix for removing any remaining copper from a electroless copper tank prior to use.

Adding by weight 2% of Potassium chlorate to a 10% Nitric Acid solution allows it to etch brass. Normal reaction as a copper etchent is:-

3Cu + 2NO₃^- + 4H⁺ >> 3Cu²⁺ + 2NO₂ + 2H₂O

Persulfate 

Etching