Best and Easiest way to refine gold dust to get % purity
It (melting gold) is dropped in box and 400 ml of nitric acid and 1200 ml of HCl. It will do as 1 hour then we keep at for night. Tomorrow morning we will take the gold mixing water and filter the water. The filtering water we mix the chemical water to that (per 100 grams old gold, 1 liter chemical water).