Simplicity Gold & Platinum Refining System
To be blunt, if you don't already have one, you either weren't aware of its existence or you've made a costly mistake by not buying one before. It's that simple.
There is nothing in your shop that you can't refine yourself (though things like polishing sweeps do require some preprocessing).
How does it work?
Using a battery charger or rectifier and the Simplicity, your scrap gold and/or platinum is stripped (dissolved) into a special salt-water bath.
Add powder which turns the gold, but not the other metals, back into solid form. While the pure gold drops to the bottom as small particles, the other metals remain dissolved.
Pour off the water, and then rise, dry, and melt the resulting fine gold particles.
The result is gold of 99.95% purity with losses of metal left dissolved in the waste water of less than .01 dwt. If desired, the other metals can be removed from the water by the addition of aluminum foil. A special ceramic cell prevents the metal from plating out of the water.