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Message:: [QUOTE="Cloudsweeper99, post: 59590, member: 3011"]That's a facinating post.  Apparently some of the most cherished "facts" in the hobby might be very close to being old wives tales.  So on the one hand it might be a good idea if some people or organizations research new cleaning and preservation instead of just repeating the "no cleaning permitted" mantra -- not to force any changes but just to see what they can discover.  Maybe some of the new breakthroughs in nanotechnology can be applied to numismatics.  On the other hand, once a coin is toned, I would imagine that the surface is generally protected from further "damage" and since the initial "damage" is incredibly slight, it's better to just leave the coins alone and toned, and they should stay in that condition basically forever.[/QUOTE]