I wouldn't encourage the use of lacquer. It's just not durable. Here
are some suggestions assuming that you are making your own copper
*Add 4% gold to copper and play with that alloy (shakudo). Though the
gold 'ennobles' the copper the ratio might be too low at 4% to
prevent a black mark on the skin.
*Add 10% silver to copper and play with that.
*Heat-colour 100%Cu (cherry-red then quench in boiling water). the
burgundy colouring is quite stable.
Failing all those, try this:
*Join the ideas-only people and make unwearable jewelelry
Auckland NEW ZEALAND