Ah, I've never used sulfuric at a concentration that high before. It's rather hard to get in NJ. The purest I can get is from Rooto, and that has the organic inhibitors in it, so you have to add a little water and heat to make it do much of anything to metal.
I will finally be able to get a gallon of concentrated, so it's good to know this additional detail. So I could use a steel mesh strainer to separate the base metal bits from the gold particles. Hmmm, how does one go about separating the larger pieces of gold foil with this method?
