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<p>[QUOTE=&quot;SuperDave, post: 2300102, member: 1892&quot;]That Stonybrook article has been linked a thousand times times in discussions of acetone, and I&#039;ve debunked it a thousand times. You have to work <b>hard</b> to get enough light and enough humidity into the picture to force that reaction - I&#039;ve done it successfully, it takes <b>hours</b> - and if your conservation technique is that sloppy you deserve what you get. It is simply not a factor for anyone capable of using acetone without splashing it all over themselves.</p><p><br /></p><p>With that said, knowledge is a process, not a place. Even though I <b>know</b> acetone cannot affect metals except <b>only</b> copper, and <b>only</b> under those extreme outlying circumstances - I know this for the same reason I know the Sun is bright, the laws of physics dictate it - I&#039;m not discounting what Numismat is saying. He sees what he sees, this isn&#039;t his first time on the merry-go-round.</p><p><br /></p><p>Is it because the acetone only partially removed what&#039;s causing the color? Was there a layer of lacquer or something disabling the thin-film reflection angles and hiding existing toning? I dunno; all I know is that acetone couldn&#039;t be a part of the reaction.[/QUOTE]</p><p><br /></p>

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