Sometimes, I have trouble writing with a ball pen, when the paper is "dirty". The pen just stops working, and I have to unblock the ball by writing on another piece of paper that does not cause any trouble before being able to use the pen again on the original paper. This is annoying.
I am actually not sure what the "dirt" is (dust, slightly humid or oily paper...?). But I am sure many other people have experienced the same problem: it's definitely a problem of the paper, not the pen; it usually happens on notebook paper rather than paper for printers, and not on all pages on a same notebook.
How can I write on such paper with my usual ball pen without having to switch every few seconds to the secondary paper?
(And bonus question: What is wrong with the paper?)