What causes a stamp to turn this color? It still has some gum on the back.
I'm not asking if it's bluish paper. It legitimately looks dirty. I'm just curious what causes the paper turn so much but it's kept gum so I don't know if it could be a liquid.
The ink of several orange stamps of the U.S. is prone to oxidise, rust. That's what I see there. If you'd like to conserve them, there are ways to go about that, and without damaging the stamp. This one of mine had oxidised...
Hydrogen-peroxide is what I used to restore that one. It's good to know that...sulphurised. Such has plagued me on more than one occasion. I've gotten so good at it that I can confidently restore mint stamps, and without disturbing the original gum.
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Posted 03/21/2018 12:13 am
