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Mar 29, 2016 · Photographic chemicals can tarnish jewelry, and even other harsh chemicals such as nitric acid or cleaning agents which create salt solutions which blacken the skin. Even changes in body chemistry can cause silver to tarnish. The skin contains thousands of perspiration glands. These glands emit enough fatty acids to actually cause a chemical reaction.
https://socratic.org/questions/is-tarnishing-considered-a-physical-or-chemical-change
Nov 28, 2016 · Explanation: Chemical change is characterized by the formation of new substances, and the making and breaking of chemical bonds. When a metal tarnishes, typically copper, brass, silver, aluminum, or magnesium, it reacts with atmospheric oxygen to form a thin oxide coating. When iron tarnishes, we call the phenomenon rusting. Some metals, particularly gold, are very resistant to tarnishing, …
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