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<p>[QUOTE=&quot;2manybooks, post: 9109245, member: 8267&quot;]Tarnish is a type of corrosion, forming when the outer layer of the silver reacts with pollutants in the air (primarily sulfur compounds), forming silver sulfide. Tarnish on sterling silver (as well as less pure silver) also likely contains some copper sulfides.&nbsp; Polishing the silver removes the tarnish and the transformed silver it contains, and exposes a new silver surface to the environment. Repeated cycles of tarnishing and polishing will eventually wear away the original silver. A layer of tarnish, left alone,&nbsp; can actually provide some protection to the underlying silver.</p><p><br /></p><p><a href="https://www.canada.ca/en/conservation-institute/services/training-learning/in-person-workshops/understanding-silver-tarnish.html" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.canada.ca/en/conservation-institute/services/training-learning/in-person-workshops/understanding-silver-tarnish.html" rel="nofollow">https://www.canada.ca/en/conservation-institute/services/training-learning/in-person-workshops/understanding-silver-tarnish.html</a>[/QUOTE]</p><p><br /></p>

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