Discussion - Member to Member Sales - Research Center
Discussion - Member to Member Sales - Research Center
I'm asking because I researching a company's cancel (1898 Series Revenue Stamps).
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Lead was a common component of inks used on postage stamps. Think of the oranges that have since turned brown (and may return to orange in the presence of hydrogen peroxide).
Don't eat them.
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03:20:23pm
Lead doesn't turn brown, iron does.
Roy
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In my example, lead in the ink grabs environmental sulfur and turns the oranges and yellows to brown. Hydrogen peroxide can often restore the original color by giving up one of its oxygen atoms through oxidation.
If you don't deal with the original sulfur issue, the stamp can revert to brown.
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Does sor member(s) know if lead was ever used in printing ink for stamps?
I'm asking because I researching a company's cancel (1898 Series Revenue Stamps).
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re: Lead in Printing Ink?
Lead was a common component of inks used on postage stamps. Think of the oranges that have since turned brown (and may return to orange in the presence of hydrogen peroxide).
Don't eat them.
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30 Jan 2025
03:20:23pm
re: Lead in Printing Ink?
Lead doesn't turn brown, iron does.
Roy
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this post
re: Lead in Printing Ink?
In my example, lead in the ink grabs environmental sulfur and turns the oranges and yellows to brown. Hydrogen peroxide can often restore the original color by giving up one of its oxygen atoms through oxidation.
If you don't deal with the original sulfur issue, the stamp can revert to brown.
3 Members
like this post.
Login to Like.