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<p>[QUOTE=&quot;halfcent1793, post: 4073274, member: 86853&quot;]I published a study of several cleaning agents in 2018. One of them was MS70. Here&#039;s what I wrote:</p><p><br /></p><p>It isn’t an acid dip. According to the label, MS70 contains 2-butoxyethanol (CH3CH2CH2CH2OC2H4OH) and potassium hydroxide (KOH) in concentrations that are unspecified. Other sources claim it also contains sodium gluconate (NaC6H11O7), a chelating (metal binding)&nbsp; agent. 2-butoxyethanol is a surfactant, so it functions as a wetting agent, allowing the KOH and sodium gluconate to interact with the surface of the coin. KOH is a strong alkali, and a major component of drain cleaners, so it can be presumed to act by attacking acids or oils; the haze must be an acidic or oily substance. Because the KOH turns the lipids in your skin to soap (no, I’m NOT kidding), it is not a good idea to get it on your skin. If you do, you will immediately feel your skin start to saponify (<i>i.e., </i>turn to soap). Obviously, you will need to rinse very thoroughly right away.</p><p><br /></p><p>Should you use MS70 on copper? According to the label, it is safe to use on gold, silver, nickel, copper, bronze and brass. But <i>is </i>it safe, and if so, what does it do? According to the online forums, MS70 will turn copper blue or purple. Not to be deterred, I first tested it on bright red 2017 P and partially toned 1986 Lincoln cents. The new one came out very flashy and still red. OK, but that’s how it looked before. The coin that was partially toned was not changed, except that the toning was, indeed, bluer than it had been before; such a color change is characteristic of toned high-grade copper coins that have been degreased. A quick brushing with Blue Ribbon restored the more subdued color to the toning. When used on a fully brown early copper, the product had no effect other than to remove oil from the surface. Conclusion: once the original color is gone, MS70 will not bring it back, but at least the product does no immediate harm.[/QUOTE]</p><p><br /></p>

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