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Message:: [QUOTE="kanga, post: 1950871, member: 9270"]This may open a can of worms but I think it's a useful effort.The idea is to keep it as simple as reasonable BUT correct and comprehensive.I'm looking for changes, additions and deletions to this FIRST attempt. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ The difference between "conserving" and "cleaning". "Conserving" is the process of removing debris from the surface of a coin that IS NOT a product of the coining metal's reaction with the environment.The original coin's surface IS NOT changed by the process.Dirt, glue and stuff like that. "Cleaning" is the process of removing "something" from the surface of a coin that IS a product of the coining metal's reaction with the environment.The original coin's surface IS changed by the process. There is metal loss.Toning, verdigris and PVC damage are common examples.[/QUOTE]