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
