Patina is a thin green layer of copper sulphate, which is formed on copper and copper alloys due to corrosion. This term can also be used for shades on any surface, formed as a result of aging and use. Adding copper to copper nitrate can produce a wide range of colors from bright turquoise to green and brown.
Patinatsiya most often occurs on copper and copper alloys, but may also occur on silver. Gold and platinum amenable patinatsii very bad, because they do not oxidize in air. Nor can patinatsiya on the tin, lead, aluminum and tsieke.
For patinatsii jewelry jewelers use a variety of techniques and recipes. For patenatsii silver used sulfur, which converts the surface of silver jewelry in sulfate silver. If you soak the silver in solution is more time and adjust the temperature of the solution, we can obtain a series of surface color jewelry, such as red, orange, brown, purple, blue, green, gray. More silver surface darkens to black.
Light, bright colors are obtained by exposure of silver in the solution from a few seconds to half an hour. If you need to get on the silver surface black film, you can use a mixture of hydrochloric acid and tellurium, called “Maximum black oxidizer”
A necklace of silver 925 and brass, handmade, acid etching, the artist Staff Corsage