Sterling silver, frequently denoted as 925 silver, is an alloy composed of 92.5% silver and 7.5% other metals, typically copper. This composition makes it more durable than pure silver, which is too soft for most practical applications. A visible darkening or discoloration on the surface of this alloy is a common occurrence, affecting its aesthetic appeal over time.
This characteristic is a natural chemical reaction and does not necessarily indicate poor quality. The presence of copper in the alloy, while enhancing its strength, also makes it susceptible to reacting with sulfur-containing compounds in the air. These compounds are present in various environments and contribute to the formation of silver sulfide, which presents as a dark layer on the metal’s surface. Preventing this occurrence entirely is challenging, although certain measures can slow the process.
