Blackening of silver. This procedure is aimed at giving silver items the features of old products. The solutions used usually contain sodium or potassium sulfides or polysulfides, and most often ammonium carbonate. Sulfides and polysulfides are unstable and difficult to obtain for an amateur. Silver can also be blackened easily, but not a very pleasant way: old broken chicken egg stir in 500 cm3 of the containing solution 5 g of ammonium carbonate. In such a prepared bath, immerse silver objects until the desired degree of blackening is obtained. Due to the very unpleasant smell, this treatment should be carried out outdoors. After rinsing thoroughly, dry the item.