Verdigris: 
a bright bluish-green encrustation or patina formed on copper or brass by atmospheric oxidation, consisting of basic copper carbonate. This can be speeded up which I do using a combination of items including: ammonia, salt, vinegar, miracle grow and even at times potato chips!  It's a science experiment and I never know how it's going to turn out!
 
Copper hammered with an antique patina.
Ear wires are hypoallergenic titanium