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Another NEWP, and medal/exonumia guru advice (conservation question)
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<p>[QUOTE="GDJMSP, post: 3601986, member: 112"]The only reason oil seemingly stops or slows down corrosion is because oil provides a moisture and air barrier - and without moisture and air, additional corrosion stops. But whatever has already been done, is done forever.</p><p><br /></p><p>Oils have an additional problem of their own, their effectiveness is temporary. And once the oil reaches a certain age, and that age varies with each type, it can have its own downsides, and even be harmful at times. And once that begins then the oil has to be removed. </p><p><br /></p><p>And sometimes, oil that has been in place for a long time gets a look to it that is very similar to what we are seeing on this particular coin. Ya see, oil on a coin, even when spread ever so thinly, is like a sticky agent. Dirt and contaminants in the air stick to it, they become adhered and accumulate, particularly in the protected areas like right at the edge of the devices because the oil is thicker there - there's more of it there. And those contaminants, well, they can create their own corrosion.</p><p><br /></p><p>A better solution than oil is simpler, and has none of the downsides of oil, but it requires a bit more effort - proper storage. Proper storage limits air and moisture to the point that their effects are negligible, or at least slowed so down so much that it cannot be noticed. </p><p><br /></p><p>So, [USER=71642]@Stork[/USER] , what to do about the coin ? Can't be sure of course, but what I do know is this. Pictures are always different, some show things some don't things. Even when the lighting is exactly the same, camera settings are exactly the same, if there is even the tiniest change in angles - one pic will look different than the others. So yeah, pics can hide things, but they can't show you something that simply isn't there. If a certain pic shows you something, well then it's there. </p><p><br /></p><p>Anyway, looking at your pics, the full size pics not the closeups, it looks to me like there is an accumulation of "something" in the more protected areas. The same kind of something that you can see in your closeups. Looking at the auction pics, I see the same kind of thing, just not as much of it as I can see in yours. That indicates to me that "something" is there. Could it be an accumulation of oil and contaminants ? Yup, sure could, but it could just as easily be almost anything else. But, if it was just corrosion, I would expect some greenish cast to it - and I don't see any of that, not even a tiny bit. And I'll admit I'm guessing here, but it's educated guess - and oil and gunk buildup would be my guess. </p><p><br /></p><p>If it were me, I'd give it a good soak in xylene. And every now n then picking it up by the edges and swishing it around, vigorously if ya can. Then put it more clean xylene and let it soak some more. Repeat that process 3 times with a final rinse in distilled water. Then stand the medal on edge and let it air dry.</p><p><br /></p><p>And yeah, I already know all the arguments about my suggested last step - heard 'em all a thousand times. But I stick to my advice. That's what ya asked for advice, and now you have mine. Up to you to listen or not.[/QUOTE]</p><p><br /></p>
[QUOTE="GDJMSP, post: 3601986, member: 112"]The only reason oil seemingly stops or slows down corrosion is because oil provides a moisture and air barrier - and without moisture and air, additional corrosion stops. But whatever has already been done, is done forever. Oils have an additional problem of their own, their effectiveness is temporary. And once the oil reaches a certain age, and that age varies with each type, it can have its own downsides, and even be harmful at times. And once that begins then the oil has to be removed. And sometimes, oil that has been in place for a long time gets a look to it that is very similar to what we are seeing on this particular coin. Ya see, oil on a coin, even when spread ever so thinly, is like a sticky agent. Dirt and contaminants in the air stick to it, they become adhered and accumulate, particularly in the protected areas like right at the edge of the devices because the oil is thicker there - there's more of it there. And those contaminants, well, they can create their own corrosion. A better solution than oil is simpler, and has none of the downsides of oil, but it requires a bit more effort - proper storage. Proper storage limits air and moisture to the point that their effects are negligible, or at least slowed so down so much that it cannot be noticed. So, [USER=71642]@Stork[/USER] , what to do about the coin ? Can't be sure of course, but what I do know is this. Pictures are always different, some show things some don't things. Even when the lighting is exactly the same, camera settings are exactly the same, if there is even the tiniest change in angles - one pic will look different than the others. So yeah, pics can hide things, but they can't show you something that simply isn't there. If a certain pic shows you something, well then it's there. Anyway, looking at your pics, the full size pics not the closeups, it looks to me like there is an accumulation of "something" in the more protected areas. The same kind of something that you can see in your closeups. Looking at the auction pics, I see the same kind of thing, just not as much of it as I can see in yours. That indicates to me that "something" is there. Could it be an accumulation of oil and contaminants ? Yup, sure could, but it could just as easily be almost anything else. But, if it was just corrosion, I would expect some greenish cast to it - and I don't see any of that, not even a tiny bit. And I'll admit I'm guessing here, but it's educated guess - and oil and gunk buildup would be my guess. If it were me, I'd give it a good soak in xylene. And every now n then picking it up by the edges and swishing it around, vigorously if ya can. Then put it more clean xylene and let it soak some more. Repeat that process 3 times with a final rinse in distilled water. Then stand the medal on edge and let it air dry. And yeah, I already know all the arguments about my suggested last step - heard 'em all a thousand times. But I stick to my advice. That's what ya asked for advice, and now you have mine. Up to you to listen or not.[/QUOTE]
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Another NEWP, and medal/exonumia guru advice (conservation question)
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