THE ULTIMATE GUIDE TO GOLD FROM ELECTRONIC SCRAP

These uncleaned places will never gold plate and may oxidize. The oxidization (grey) is what you are observing. There isn't any way around this concern with the present time. Just go on to use the computer.I crushed two (two) pentium pro chips pretty great and ran them by an Aqua Regia of Nitrate soda and hydrocloric. I then neutrilized the nitric