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<p>[QUOTE=&quot;desertgem, post: 890809, member: 15199&quot;]I always find these threads interesting as to the use of natural and artificial. I do agree with Doug&#039;s assertion that intent is the difference between them. Time is not, as what may tone untouched in your area may take 10 years more than in someone else&#039;s area. The chemical reactions ( given the same chemicals, either artificially or naturally) will have the same end point on the same coin. Color or location of toning~ yes here is where either bad luck or bad doctoring can give a seemingly market unacceptability appearance, but if done well, no one can tell, no one except the originator of course. Toning not apropos to the wear level of the coin is also another indicator, but if you can&#039;t tell grading wear, you can&#039;t determine this either. I continually expect a pro toning apparatus to appear for sell ( if not already in the black market), incorporating computerized gas flow sequencing to react the coin and a photosensor to determine the end points. Reactive and inert flushing gases could be diffused into cardboard/paper fiber liners to give the &quot;old album&quot;, kraft paper envelope, or Bag toned, upon a quick change. The chemistry is known. and if the operator or gang of operators were well versed in what natural toning looked like ( takes experience), they could crank out acceptable coins.&nbsp; Even if 1/3 got TPGed, it would be a profitable business, as the others could be dipped and recycled a few times.</p><p><br /></p><p>I also keep reading the theoretical journals hoping to see if someone has determined a scientific way to determine excellent AT, and nothing on the horizon. Terms like &quot;Floats on the surface&quot;, etc. have no differential scientific value IMO.</p><p><br /></p><p>So to me, putting a coin in acidic sulfurous cardboard holders, albums , envelopes, taco napkins, or from hydrogen sulfide gas directly is the same if the intent is to produce toning, whether it takes 1 day or 10 years, what is the difference really?</p><p><br /></p><p><br /></p><p>IMO of course.[/QUOTE]</p><p><br /></p>

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