· Smelting gold usually involves hightech and highcost tools to perform. Mostly, mining companies do the procedure, which sees one material bonded to or released from another in the presence of extreme heat. However, prospectors, and people at home, can smelt their old gold using some simple steps. All it requires is access to a few common minerals and .
· This method is used to prepare sols of metals such as platinum, silver, copper or gold. ... UltraCentrifugation. In this method, the colloidal sol is taken in a tube which is placed in an ultra centrifuge. On rotation of the tube at high speeds, the colloidal particles settle down at the bottom of the tube and the impurities remain down in the solution called centrifugate. The .