I do know that I can only wear either all silver or all gold jewelry, any plated that wears off, I either break out or the body part turns either green or blue! I do remember when I was little, my mom had something on her hands that she used to call crud, she could only use Palmolive detergent to wash anything, and Prell to wash her hair anything else that she use she would break out something awful. And the same thing with the jewelry, if it was not 100% pure she just playing could not wear it. And my sisters, all have the same problem.