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<p>[QUOTE=&quot;calcol, post: 3860189, member: 77639&quot;]Some technical grades of acetone may be only 95% acetone.&nbsp; See the first link below for ACROS (a common lab brand) technical acetone.&nbsp; The acetone sold as painters&#039; solvent may be even less pure.&nbsp; Sometimes the MSDs for painters&#039; acetone will state the purity is 100% or even 100.0% percent.&nbsp; See link 2 below for MSD for Klean Strip (sold by Amazon and Home Depot).&nbsp; If you believe this, I have some MS70 coins dated 1800 to sell you.&nbsp; They make the same ridiculous claim for their toluene.&nbsp; They are more honest for their xylene, which may only be 2/3 pure.&nbsp; Sometimes there can be conflict within the same spec document.&nbsp; In one part of their spec sheet, Sunnyside claims their industrial acetone is 100%, but 99.5% in another part.&nbsp; See link 3.&nbsp; I&#039;m skeptical of the purity of any painters&#039; or other industrial grades of acetone.&nbsp; And would not use a technical or industrial grade on coins regardless of what their spec sheets say. </p><p><br /></p><p>What are the impurities in acetone?&nbsp; A common one is acetic acid, but there are others.</p><p><br /></p><p>Acetone that meets specs as ACS reagent grade&nbsp; (a believable 99.9%) is cheap enough and safe&nbsp; to use on coins.&nbsp; It&#039;s widely available as different brands from a variety of sellers. A gallon with tax and shipping can be bought for $75 or less.&nbsp; A gallon will last a long time.&nbsp; Smaller volumes cost less total, but more per ounce.&nbsp; Why not use the best on your coins?</p><p><br /></p><p>Cal</p><p><br /></p><p>Links:</p><p><br /></p><p>1.&nbsp; <a href="https://www.fishersci.co.uk/shop/products/acetone-technical-acros-organics-2/13277983" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.fishersci.co.uk/shop/products/acetone-technical-acros-organics-2/13277983" rel="nofollow">https://www.fishersci.co.uk/shop/products/acetone-technical-acros-organics-2/13277983</a></p><p><br /></p><p>2.&nbsp; <a href="http://www.kleanstrip.com/uploads/documents/GAC18_SDS-LL34.pdf" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.kleanstrip.com/uploads/documents/GAC18_SDS-LL34.pdf" rel="nofollow">http://www.kleanstrip.com/uploads/documents/GAC18_SDS-LL34.pdf</a></p><p><br /></p><p>3. <a href="https://www.sunnysidecorp.com/pdfs/Data_Sheet_840G5.pdf" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.sunnysidecorp.com/pdfs/Data_Sheet_840G5.pdf" rel="nofollow">https://www.sunnysidecorp.com/pdfs/Data_Sheet_840G5.pdf</a>[/QUOTE]</p><p><br /></p>

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