also would say that those stamps which were originally discolored seemed to revert back quicker than similar stamps stored in the same environment.
I just want to highlight this statement that you made, as its obviously important.
I sense that you are likely correct about this, but, nevertheless, what is your basis for this statement?
If its really true, then, one wonders how long it takes a treated stamp to re-sulphurize? Presumably, its proportionate to the content of Sulphur Dioxide (SO2) in the atmosphere at a given spot and the ink chemistry of the stamp itself.
It certainly makes sense to me that based upon the chemical composition of some inks, that some could be more susceptible to this. Treating them, removes the SO2 but it then reappears at some rate.
The point here, is its not the H2O2 that has anything to do with this, but, rather, the chemical composition of the ink itself, and the surrounding environment. The H2O2 temporarily pretties it up.
I get your point, and its a very useful take.
I think we may have one example already, with philazilla's stamp, which pretty clearly went bad in less than 10 years, apparently.