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In this video I will try to get a small amount of sediment from the spent acids. Then I will check this sediment for the content of DM. Look what I got from this. Enjoy watching. Friends, at low voltage 3-4v, electrolysis took a long time.. you need to extinguish the nitrogen completely or dilute the solution at least twice.. There is a partial dissolution of the sediment back.. as a result, the experiment was not completed to the end.. but I managed to extract copper and impurities 675 g and 0.43 g of gold.. If you bring the experiment to the finish, I think the results will double.. Good luck to everyone..