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<p>[QUOTE=&quot;4to2centBC, post: 2272130, member: 76181&quot;]Some surfaces can rainbow (yes I am using a noun as a verb) easier than others and they can come off just as easily. My silver Jacobian medal came simply toned, I put it with some boiled egg yolk in a tupperware for a few days to see what would happen and it acquired a wonderful color. When it was stolen, the combination of someone wiping it clean of fingerprints and the dusting powder the police used afterwards quickly reverted it to its non-Rainbow tone. I may or may not do it again someday with the medal. I tried this with a couple other coins (the stolen coin from Thasos for instance) and it did not rainbow at all. They had lightly toned surfaces and were not blast white.&nbsp; I would not bother trying to improve a coin that already had a nice patina. But if it was a lesser coin and blast white I might try to tart it up a bit. Too much rainbow however gets to be a bit much. </p><p><br /></p><p>btw since I know how impermanent a rainbow tint is, and how easy it is to achieve, and how easily it can be lost, I won&#039;t pay more for it.&nbsp; If I find a coin with a long provenance and a good patina acquired over time, I will pay more for that.[/QUOTE]</p><p><br /></p>

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