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<p>[QUOTE=&quot;alurid, post: 7871731, member: 81991&quot;]Exposure to chemicals and/or heat cause metals to colorize. Its called tarnish if its on your silverware or jewelry. Called toning when on a coin.</p><p>I think your coin was cleaned along time ago (50-80 yrs.) and has toned due to the chemicals used at that time. Sulfur will make copper and silver turn black, ammonia likes to make copper and silver turn blue and purple.</p><p>Folks have different opinions/definitions of artificial toning. I don&#039;t think your coin was purposely AT&#039;d due to most of it being on the reverse. Which I think was probably caused from being in a book/album with a closed backing that trapped the residual chemicals from the cleaning that made the metal tone.. Your coin has most likely been it storage for more than 120+ years of its 130 year life. </p><p>Just thoughts from my limited knowledge.[/QUOTE]</p><p><br /></p>

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