Gold, very pure 1 chloride

During the electrolytic step of copper production an anode slime is obtained, containing the noble metals of the ore. They are extracted by a compHcated process. Raw silver is obtained by melting, and is used as a new anode material. In an electrolytic process with nitric acid as electrolyte silver dissolves from the anode while gold and platinum form a new anode sHme. Silver is precipitated from the electrolyte as silver chloride. This is melted with soda and saltpeter at 1000°C. The molten silver is cast into bars and remelted in vacuum to yield very pure, gas-free silver. 

Lastly, the gold is well washed, dried, and mixed with its own weight of bisulphatn of petassa, or a small quantity of borax and nitre, and fused in a Hessian crucible exposed ta a very strong beat. By this operation, the last portions of chloride of silver are removed, and a button of perfectly pure gold is obtained. 

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