Qiladi 925 Kumush zargarlik buyumlari ishlab chiqaruvchilari CZ Halo Tennis Bracelet 925 kumush zang?
sof kumush (yoki 925 kumush) may turn black from the reaction with certain elements in the environment, mostly sulfur but the surface oidation product is very different from those that form on iron and is often just called tarnish which is easily removed with some silver polish and restoring the surface to its original brillance.
Rust that forms on ferrous based materials is not so tightly bonded ot the surface and can destroy the iron frame on an automobile in several years on a wet corrosive environment.