Knowledge of marking pens

The marking pen is a Writing of the pressure “zero”

Unlike ballpoint pen and the like, the marking uses a capillary phenomenon, and the pen tip is also responsible for its function, so you hardly need pressure when writing. Because the core is relatively soft, weak to fall and high pressure, it is unsuitable for carbon copying.
When the ink decreases and the handwriting becomes thin, it is a translation which tries to write strongly by all means as our habit, and this is an act not gentle to the pen when the pen tip is damaged or it is choked. I should write slowly, but if the ink is thin, I think that it thickens if I put power, it might be a general psychology. Please be careful.