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<p>[QUOTE=&quot;Kryptonitecomic, post: 1038248, member: 26784&quot;]The top layer of black silver sulfide in not considered corrosion by anyone that I know but from a technical standpoint I agree it could be considered corrosion. Rust would be more accurate form of corrosion but we all know that silver does not rust. Have you seen 2,000 year old coins pulled out of the ground? How could that be if silver truly corroded in the pure sense of the word becuase after 2000 years there would be nothing left. I see your point but I don&#039;t know anyone in the coin world who calls toning on silver coins corrosion other than perhaps ricko on the PCGS forums or perhaps Weimer White ...they call it toning or tarnish.</p><p><br /></p><p>Definition of Corrosion is the disintegration of an engineered material into its constituent atoms due to chemical reactions with its surroundings. I don&#039;t see silver coins desintegrating but you could consider that top layer of metal to be oxidized or desentigrated. Perhaps you should get a better handle on the use of the term corrosion in as it relates to Silver vs asking me to reevalute my beliefs which are based on facts as well?[/QUOTE]</p><p><br /></p>

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