Guy’s I really need some help.
As I mentioned previously I am having diamonds go black on me when I
am rhodium plating. They are fine during working and then electro
cleaning but going black in the plating. I have changed my solutions,
cleaned the anodes. It doesn’t happen to all the stones, just some.
Even if there is no metal behind them. I have never seen it before, I
just can’t figure it out and it is nearly impossible to get off. I
don’t know what to do because it seems to only happen to ring I get
from the trade/retail and not mine.