Do not use your fingers because the oils, moisture, acids and salts present in the skin might be transferred to the paper. To remove the powder, use a soft brush, working from the center out, brushing in one direction. To remove graphite or soft pencil markings, you may have to use an eraser, even though a minimal slight surface damage will result. It is very important that you select the proper type of eraser in order to minimize surface damage. Most erasers are made from rubber or polyvinyl chloride.
Some erasers contain very harsh abrasives.
We should select a soft eraser in order to minimize surface damage and abrasion. Residue and fiber damage are relatively low. When an eraser is applied to a stamp or cover, support the philatelic item by placing it on blotting paper. When the eraser becomes rounded from use, cut it to a clean edge. Remember that several gentle rubbings are far better than a single vigorous one.