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Nitric Acid:-
 

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

 

 
                          

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