Followup: Blue Toned 1864 2c Small Motto (Pic Heavy) - Page 2

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Author	Replies: 18 / Views: 2,753	Page: of 2

hadleydog Pillar of the Community Canada 1267 Posts	Posted 03/08/2018 8:25 pm From what I understand, the ms70 is not the source of the blue toning. Copper pipe will not stay red over time, it tends to develop a blue tone to it. It's chemical composition is CuSO3 or CuSO4 which are both known to have bluish or greenish coloration. Applying MS70 or acetone is not reactive with either of the copper sulfate compounds previously cited..... but they will remove the overlying film that hides the color of the sulfates. So, the blue toning was there all along, it was just hidden. It also explains then why you can't tone red copper blue with ms70. Eliasburg collected copper with this look to it, long before ms70 appeared. Report this Post to the Staff
Jon Brand Pillar of the Community United States 1023 Posts	Posted 03/09/2018 4:41 pm Hadley and everyone- thanks for opinions and info. MS70 is the reason I asked these questions. A few people strongly believe that is the case, and many don't. I know that this coin has been in this holder for a bunch of years (even though its the new holder style) and I am curious what the lifespan of that kind of chemical treatment would be and what the copper would look like after? I intend to eventually have this sent to CAC as a last opinion. Report this Post to the Staff
bandsdean Pillar of the Community United States 2125 Posts	Posted 03/13/2018 7:13 pm Love this one! Report this Post to the Staff
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