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Message:: [QUOTE="GDJMSP, post: 655955, member: 112"]The answer was responsive 13 posts ago. As to your new question, the reason you have heard of so many different things being used by the mint is because they keep experimenting with new cleaning solutions, burnishing solutions and lubricating solutions all the time and have for years. So it depends on when (what year) as well. Again, a complicated answer because it is a complicated question. It also depends on which type of planchet is being washed as they use different solutions for different planchets. And we must be clear on this point, quite often, it is not even the mint doing the washing of the planchets. It is the private contractor that the mint buys the planchets from. And it also depends on whether you are talking about business strikes, Mint Sets, or Proofs. All are treated differently and often the work is performed by different entities, meaning either the mint or one of their contractors. Now, answering your question is more difficult because the mint is very tight lipped about about giving out such information. Quite often they flat out refuse to divulge the information. The only information that I know to be documented by the mint would be for the 2009 Proof cents. And then, only part of the information is available, that being the final rinse only. For the final rinse they use alcohol. But we do no tknow what kind of alcohol or if there were any admixtures in the alcohol.[/QUOTE]