OT: What is the best way to clean varnish off of copper?
Feb 22, 2018#0183;#32;Burn the wire in a hot fire so there''s only copper oxide left and soak in diluted hydrochloric acid and hydrogen peroxide, don''t leave it in too long as it will definitely dissolve copper after it''s eaten the copper oxide. You can save the resulting lime green copper chloride liquid for