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Am I correct or is using graphite a common method that can be removed with an eraser without damaging the stamp? By graphite, do you mean using the side of a pencil point?
This method is common, but I have not personally tried it. You take a pencil and scribble on a piece of paper to build up loose graphite. Using your finger, rub the graphite lightly on the grill(s) to highlight them. You can either leave the graphite on the stamp or use a soft eraser to remove the graphite. Personally, I would just leave the marks as-is.
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the stamp's actual paper color is just like it appears; toned, dirty or whatever else might be the cause of the discoloration.
The paper appears dirty and might clean up with a warm water soak. I wouldnt' do anything more than that. The damage is unfortunate, but because of the multiple grills, still quite collectable!
Brian