Paper is mostly manufactured with an even distribution of cellulose fibres with small pores. When we write in ink, it moves down into the pores of the paper, where it will remain to dry. To erase off ink-marks, it is difficult for the rubber to separate the intermolecular forces. Therefore, it has to be physically scratched down to the level of the dried dyes and eliminate the text that way. Pencils are primarily composed of graphite and graphite particles get stuck on the paper fibres. While erasing, friction is created with rubber, and graphite particles get stuck to the rubber molecules.
Why is it easy to erase off pencil-marks from paper but not ink-marks?
