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<p>[QUOTE=&quot;Pavlos, post: 3208357, member: 96635&quot;]Sorry, but I trust David Sear on this one <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /></p><p><br /></p><p><br /></p><p><br /></p><p>How do you know the person who cleaned this coin used &quot;dilute acid&quot;. Who knows that person was an idiot, did not know what he was doing and put it in concentrated strong acid. Or who knows that person wanted to sell his coins quick and put it in concentrated strong acid so the coin would be quicker cleaned?</p><p><br /></p><p>I have seen nitric acid with copper many times. It will look very shiny and an unbelievable unregular surface, just like the coin above. As I said, you don&#039;t know the history of this coin nor the way it is cleaned. If you don&#039;t have chemical knowledge then don&#039;t rule out that no chemicals have caused this, it will always stay a possibility.</p><p><br /></p><p>Besides that, what is your definition of &quot;dilute acid&quot;? If you mean it is low concentrated then &quot;diluted&quot; is a very wrong word to use in Chemistry. For example Hydrochloric acid is a GAS in water and never reaches more then 37% concentration, so it is diluted already. However it is still a strong acid and highly concentrated. If I put 1L concentrated acid in 10ml water it is diluted but still very high concentrated.</p><p><br /></p><p>For your definition you use the word &quot;low concentrated acid&quot;, actually even that is wrong because &quot;low&quot; is a matter of personal opinion, that&#039;s why numbers are always necessary, either percentages or ratios.</p><p><br /></p><p><br /></p><p><br /></p><p>This is extremely wrong, no internal crystallization takes place if you leave silver in saline solution. Actually silver chloride crystals are formed, the silver itself does NOT crystallize in saline environments nor is it INTERNAL. It are just silver chloride crystals that form and yes if you heat it in a bread oven then it will decompose. If you want to remove INTERNAL crystallization of the METAL silver then you need to heat till the melting point of silver. Chemistry <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie2" alt=";)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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