Copper + (KI + I2) = ??? Hi all, I have put some copper (60um - electroplated on a gold seed layer of 100nm) in the following solution: KI + I2 The copper is still there, but is now covered by a thick layer of a "grey compound"... Huh I'm really dummy in chemistry... can you help me to find out the formula of that compound ? How can I remove it without destroy the copper ? Thanks a lot!