Hi Kamikazes. Today we are going to refine gold. First we are going to weigh the gold we want to refine: 28,2 grams. We multiply the 28,2 g by 3 so that we know how much copper we have to add. 84,6 g of copper plus the 28,2 g of gold total 112,8 grams. We add copper to complete the 112,8 grams. We have the ingot mold for the molten metal, the borax to help the melting process and the crucible where we will be melting. We now put all the metal in the crucible. We apply some oil in the ingot mold so that the metal won´t stick. When the metal solidifies, we put it into water to cool it. And then we put it into sulfuric acid to remove rusting and borax. Now I will be rolling the metal to get a layer as thin as I can. I will be using the electric rolling mill. When the metal contacts with the acid, this one will attack it easily. The metal is now laminated. I am going to roll it up so that the acid attacks it evenly when I place it in the tray. We continue... After 24 hours all the silver and copper included in the metal have been eliminated by the nitric acid. Only the pure gold remains. We pour the nitric acid in the sink putting a plastic bottle under it to recover the acid and send it to a toxic waste recycling company. We rinse the gold several times to eliminate all the acid. We use a paper filter to filter the gold and remove the water. We squeeze the filter to eliminate all the water. We then use blotter paper to wrap the filter with the gold inside. We put the “ball” in alcohol so that the gold dust does not fly away when we melt the metal. We now have our refined gold. When using the nitric acid method, we obtain a gold purity of 23,5 Karats or 979 millesimals. You can measure gold purity in Karats or Millesimals. The 24K gold is equal to 1.000 millesimals, which is fine gold or pure. The origin of the word Karat is greek: “keration”, fruit of the Carob. The seeds from the Carob tree are extremely consistent in size and weight and they have been the original gauge for the gems and jewels. Then it remained a unit of weight in arabic “qīrāṭ” and then became quilate in Spanish. Here is an oddity about gold: do you know why at the Olympics, the athletes bite their gold medals? The habit comes from the 19th Century, during the gold rush. In the mines, there was a lot of pyrite, which looks like gold. The gold rushers used one of the gold main characteristics, its ductility, to make the difference. If they left a mark when biting it, it was gold. Another very important characteristic of the gold is its conductivity of electricity. It is used in electrical connectors in all types of high quality computerised devices. Therefore some companies are dedicated to refine all that electronic materiel. For instance, the printer you have at home, the part that makes the electric contact has a 24 K gold plating. And, gold is in space and resists to corrosion, this is why it is used in solar panels and other components for satellites. I hope that you enjoyed this video about how to refine gold. Give a thumbs up if you liked the video! Subscribe to the channel if you haven´t done it yet! And Kamikazes I´ll see you for the next video. Gold satellites [fffffff] Gold solar panels...