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<p>[QUOTE=&quot;superc, post: 1726271, member: 44079&quot;]I had a 34 nickel once someone had cleaned.&nbsp; &lt;I coinstar&#039;d it, or I would show it.&gt;&nbsp; Looked to me like he had taken a Dremel brush tool to it.&nbsp; Everything all bright and shiny, except around the edges of everything (such as inside the lettering and the date) where the gray tarnish continued to lurk.&nbsp; It would withstand a casual inspection and you would almost say MS, at least until you looked close, said what the f***?, and got out your pocket magnifier glass.&nbsp;&nbsp; <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /></p><p><br /></p><p>Back in the 60s, cleaning coins to remove tarnish was expected.&nbsp; Many an old coin went into some Tarnex or similar solution.&nbsp; I had one collector school chum who Brasso&#039;d old pennies.&nbsp; Times and rules change.&nbsp; If I can find the old school chum I will tell him his 1803 silver dollar should be destroyed because he ruined it by cleaning it.&nbsp; LOL.</p><p>Supposedly some of the chemical cleaning methods cause (in time) micro fissures all over the coin surfaces.&nbsp; Since these micro fissures are most often found on 100+ year old coins I am not so sure the cleaning fluids are the culprit.&nbsp; It is also possible the fissures were going to emerge anyway as metals do tend to crystallize over time.&nbsp; The Martensite vs Austenite vs Cementite phenomena has IMO allegories to some of the early coin metals.&nbsp; Copper will corrode.&nbsp; Copper in alloy will in time begin to separate out. No one alive today knows much about the conditions inside the plant where the silver was smelted for Morgan dollars or earlier silver coins.&nbsp; I think it is way premature to explain away all surface fissuring as evidence of chemical dip cleaning.</p><p><br /></p><p>This is different from coins that were cleaned by acid dip.&nbsp; Often, even after a rinse, traces of acid may remain and continue to corrode out little pits.&nbsp; I have seen that happen.&nbsp; Little corrosion craters so the coin that was so bright and shiny a month ago now looks like it had small pox or acne.&nbsp; Presumably that will continue to worsen and the best thing to do with that coin is Coinstar it.[/QUOTE]</p><p><br /></p>

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