I normally wear several sterling bracelets that I made. I rarely
take them off. They normally tarnish very slowly while being worn.
Recently someone gave me a gift of a lovely copper necklace. I put
it on, and within a few hours the copper had turned black, and had
turned my neck black as well (not green, very dark black). No big
deal so far–copper does this to some people.
BUT… all of my sterling bracelets, which never touched the copper
necklace, turned dark black as well.
I repeated the experiment later with freshly cleaned sterling
bracelets on one arm and a brand-new solid copper bracelet taken from
my show stock on the other. The exact same thing happened within about
3 hours–black copper, black skin, and black sterling.
Does anyone know why this would happen? My science geek husband
mumbled something about galvanic skin response, but when I google
that term all I find is info about biofeedback, nothing about
tarnishing silver. My curious mind wants to know (especially in case
it happens to a customer!).