The question of whether genuine silver undergoes a color change to green is frequently raised. Pure silver, in its elemental state, is highly resistant to corrosion. However, the silver commonly used in jewelry and other items is typically an alloy, often mixed with copper. It is the presence of these other metals within the alloy that can, under specific circumstances, contribute to surface discoloration.
Tarnishing is a well-known characteristic of silver alloys. This process usually manifests as a darkening or blackening of the surface due to a reaction with sulfur-containing compounds in the environment. While black tarnish is most common, the presence of moisture and chlorides can, in some instances, lead to the formation of copper chloride. Copper chloride presents as a greenish deposit on the surface of the metal. This greenish hue is not indicative of the silver itself changing color, but rather the corrosion of the copper component within the alloy.
