Why can't a brush write on red paper?

If the brush can't write on red paper or can't write clearly, it may be because there is wax on red paper or it is too smooth to absorb ink.

The first method is to wipe the red paper with a cloth to remove the wax from the red paper.

The second method is to add some wine to the ink, which can also play a very good role. I have tried many times, and both methods are ok, so I might as well try.