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<p>[QUOTE=&quot;Stork, post: 3120720, member: 71642&quot;]A bit off the track for the OP but I do have a very personal experience with the &#039;blue&#039; as it was my very own self that did it.&nbsp; Blue on other metals I&#039;ve seen too, but this is just an example of what LordM was talking about.&nbsp; &nbsp; That said, the photos look a tad juiced, and I would expect a little different look in hand, or at least only when the coin is tilted &#039;just so&#039;.</p><p><br /></p><p>This is a coin I (REALLY!!!) inadvertently left on a windowsill for about 2 years-ish.&nbsp; It&#039;s relatively common and has enough hits it was not worth all that much and I&#039;d set it down while rearranging my silver duplicates box.</p><p><br /></p><p>The sill is from a window in an uninsulated room over a former porch (now a sunroom) so it gets quite hot/cold with the seasons.&nbsp; The house was built in 1927 so who knows what kind of paint it was too.&nbsp; Unfortunately I can&#039;t remember which side was down, I suspect it was the hoo bird side.[ATTACH=full]793988[/ATTACH]</p><p><br /></p><p>So, not an attempt to make &#039;pretty toning&#039;...not exactly artificial, but perhaps a confluence of events for some accelerated natural toning.&nbsp; And in trying to describe it with so many words I feel as though we are splitting hairs.&nbsp; I didn&#039;t do anything to it with chemicals, just left it out in an environment where this happened.&nbsp; OTH how is this different than a light baking in an oven with a reactive surface (assuming it was actually the sunburst side down)?&nbsp; I guess the answer is only if it&#039;s market acceptable.</p><p><br /></p><p><br /></p><p>Now this next coin was found acceptable by PCGS.</p><p><br /></p><p>The obverse (dragon) side has a blue undertone.&nbsp; Not as bright a blue as my window sill coin of course but I have a couple other silver Japanese coins that have the reverse color scheme...in slabs by both companies.</p><p><br /></p><p><br /></p><p>[ATTACH=full]793989[/ATTACH]</p><p><br /></p><p>Having lived near Tokyo for several years I can tell you it gets very hot and humid, and the homes are generally not insulated like the general US population is accustomed to.&nbsp; Not saying I can tell you where this coin aged, but I&#039;m sure it was experiencing much more temperature fluctuation and humidity than average.[/QUOTE]</p><p><br /></p>

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