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SILVER TECHNOLOGY OF COPPER SUBJECTS
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SILVER OF COPPER SUBJECTS
Copper items are also carefully cleaned from the sludge, washed with soda solution, and lowered for several days in the spent fixing solution. Later, the silver coating of the product washed with water is also polished with a cloth rag.
SILVER COPPER COINS
A 10-15% solution of mercuric nitrate (ll) or another soluble mercury salt is poured into the porcelain cup. With a pair of tweezers put a few coins in the solution with a plus of 1-5 kopecks (1 or 5 rubles), stand them in a cup for 20-40 seconds, remove it from the solution and wipe with a napkin. Copper coins turned into "silver", which through some time will again become copper because of the erasure of mercury vaporization from the surface of the coins.
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