I worked all day trying to drop the gold out of my aqua rega mix of sodium nitrate and Hcl. I dissolved mil-spec gold plated pins in aqua rega and no matter what I do with Urea, the MSB will not drop the gold. Stannous chloride shows gold present but it’s still in there. The Aqua rega is very dark and the pins are completely desolated in the mix. The PH level is reading 2.56 I understand that a Ph of 1.0 is the threshold, and ready for the MSB, but I kept adding urea and got up to the 2.56 before I just gave up. I checked it this morning and the pot is about half full or half empty of urea hehehe. I checked the pins wile they were in process and they appeared to have cleaned all the gold off the pins I guess maybe I should have pulled the pins at that point OUT, but instead I left them in the Aqua Rega over night and the pins totally dissolved. Is there too much copper and the gold will not drop? I thought copper would not dissolve into Aqua Rega. I don’t think there is any silver in there because these pins were mil-spec non soldered unused new pins, and appeared to be a base metal of copper. I called the people at Shor and the guy said to drop all the metal out of the aqua rega with aluminum foil and rerun the dropped metal in a fresh batch of aqua rega mix, but won’t the same thing happen? He also sad jested using a plastic spaghetti strainer or mosquito netting to place the pins in the Aqua rega, and as soon as the gold is gone off the pins pull the spaghetti strainer or mosquito netting out with the left over base metal pins before they dissolve into the aqua rega solution. Well guys will I end up with gold being able to drop if I rerun what the left over stuff in the bottom of the Aqua Rega aluminum foil produced sludge or not? ..THX..<*\\\><..TOM :?: :?: