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The video review shows imported black microcircuits in which there is even more gold than in Soviet microcircuits. In the process of refining gold from imported microcircuits with hidden gilding, 55 pcs were processed.
At the beginning of the processing of the microcircuit, it was burned and ground in a soup, placed in a heat-resistant glass, poured a car electrolyte, and added nitric acid in small portions, for complete dissolution of non-precious metals, heated on an electric stove. The filtered gilding and the filter were poured with aqua regia, and dissolved gilding, after dissolving, filtered a solution containing gold, and precipitated gold with hydrazine hydrate. I washed the precipitated gold three times with water, dried it and melted it; the result pleased me.