Discussion - Member to Member Sales - Research Center
Discussion - Member to Member Sales - Research Center
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Yes, the oranges in particular suffer from sulfurization. Oxidation is the wrong term as the ink pigment does not contain iron. The orange color turns brown from smog, cigarette smoke and other airborne pollutants. (I don't know if excess flatulence has an affect on the color.)
You can recover the true color of the stamp by giving it a bath in water peroxide (3% or 5% solution). Maybe a half hour, an hour or so should do. After the color returns, wash it off in cool water.
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thank you very much 
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10:02:54pm
is it common for the inks of this issue to oxidize and darken this deeply or have I stumbled onto something?
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10:15:17pm
re: 6 cent brown washington?
Yes, the oranges in particular suffer from sulfurization. Oxidation is the wrong term as the ink pigment does not contain iron. The orange color turns brown from smog, cigarette smoke and other airborne pollutants. (I don't know if excess flatulence has an affect on the color.)
You can recover the true color of the stamp by giving it a bath in water peroxide (3% or 5% solution). Maybe a half hour, an hour or so should do. After the color returns, wash it off in cool water.
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10:27:48pm
re: 6 cent brown washington?
thank you very much
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