Some of you know that I am into liberating scrap Gold from electronic equipment. One of the difficulties with the endeavor is the use of extremely hazardous chemicals. I have been experimenting with a technique that seems to remove gold from electroplated parts by using salt, water and time. Dump the trimmed electroplated gold parts into container with water and salt and wait. Agitate every week or so, and wait, and wait. Eventually the underlying metal rusts away from the gold. I filter and then dry the iron-oxide goop that is left over. What you are left with from this process it flour gold and iron oxide powder. Lots of iron oxide. I am thinking about smelting with Borax from this point forward, but if someone has an idea to remove more of the iron oxide first, I am open for suggestions. Of course, I am loonking for non-hazardous chemical suggestions. I know Mercury could be used to slurp the gold out of the iron-oxide powder, but... Of course, this is an academic exercise, not a get-rich-quick plan.