As many webpages suggest, 3% hydrogen peroxide solution can be used to bleach paper by soaking the piece of paper into the solution. I tried and it is really quite effective.
However, if the piece of paper cannot be soaked in water (as it may have a high chance to get damaged), is it possible to put it a few millimeters above the hydrogen peroxide solution, and let the hydrogen peroxide vaporize and perform the bleaching? Does this way of bleaching work as good, not at all, or with a lower efficiency? Would I need a higher concentration of hydrogen peroxide?