The discoloration of skin, often manifesting as a greenish hue, after contact with certain types of jewelry is a common occurrence. This phenomenon, while sometimes attributed to silver, is typically linked to the presence of other metals in the alloy, particularly copper. Sterling silver, by definition, contains 92.5% silver and 7.5% of other metals, usually copper. Copper’s presence is the primary factor contributing to this discoloration, as it reacts with perspiration and other substances on the skin.
Understanding the cause of skin discoloration is essential for consumers and jewelry manufacturers alike. The tarnishing of jewelry, including sterling silver, occurs as a result of chemical reactions with environmental elements. Factors such as humidity, exposure to chemicals in lotions or cleaning products, and individual body chemistry can accelerate this process. While silver itself is relatively inert, the copper component in sterling silver readily oxidizes, forming copper oxides. These oxides are green and can transfer to the skin upon contact, resulting in visible staining.
