Message:

<p>[QUOTE=&quot;Tamaracian, post: 8375589, member: 23122&quot;][USER=76105]@Omegaraptor[/USER] Acetone won&#039;t remove toning <b>IF</b> the toning was caused by exposure to a sulfurous compound, or hydrogen sulfide/sulfur dioxide gas, as this exposure causes a thin film of mostly silver sulfide (an hence a progression of color, eventually progressing to black, depending upon the thickness of the film deposited and exposure to temperature and humidity) which is insoluble in Acetone.&nbsp; Some coins that have toning were actually exposed to a chemical which dyed the surface--usually in a monotone--and this dyed toning may be able to be dissolved or significantly lightened with a solvent like Acetone.&nbsp; <i>If you desire to remove toning--depending upon how extensive it is--you will have to use an acidified or Thiourea based &quot;dipping&quot; agent.</i>[/QUOTE]</p><p><br /></p>

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