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The metal products are also cleaned from the slime, degreased with a solution of soda , washed in water , dipped in a 50% solution of nitric acid for a few seconds, and rinsed again with distilled water. The prepared product is aged for 30-50 minutes in a hot solution containing 280 g of nickel sulphate heptahydrate per liter of water, 100 ml of concentrated hydrochloric acid . Later, the production of a nickel coating (it is also dense also shiny), the product is washed with water and polished with a cloth.