Actually, I believe that it’s a sulfur reaction. There’s a trace of
sulfur on your skin, and some people have more than others.
Just as an FYI, though, your skin has an average pH of 5.5, making
it acidic. There’s a handcream and soap out now to neutralize the
acidity of your skin, making it a neutral 7. I saw an ad for it
yesterday in a scrapbooking magazine. I have no idea if this would
have any jewelry applications, though.
6400 Baltimore National Pike
Suite #170-A, #445
Baltimore, MD 21228
"He who works with his hands is a laborer.
He who works with his hands and his head is a craftsman.
He who works with his hands, his head, and his heart is an artist."
St. Francis of Assisi