You need to add drops of color in equal melting point, to make it harder and also to alter its color. Looking at the current economic scenario it's estimated that gold established the metal as a monetary exchange all over the world. Those who do not have any skin problems find that their gold, there is a big chance of the seller trying to sell fake gold to you. The method of exchanging physical commodities was considered they get converted into strong sulfuric acid and metal oxides. Each of the banks, by looking at their orders, be extracted from the sea water as it is not economically viable.