Precautions in use
Ballpoint pens ：How to write with ballpoint pens
■ For upward writing
For ballpoint pens, ink on the surface of the ball at the tip of the ball is transferred to the paper and written. The ink is fed by gravity from the tank (in the pipe). If the pen tip is written toward the top, it will not be able to write because the ink is not supplied. In general, because it is a similar structure, it cannot be written upward. However, it is possible to write it with the pen which is supplying the ink by pressurizing in the tank. It can also be written with an aqueous ballpoint pen that can suck up ink with a capillary phenomenon.
■ For writing in water
Do not use a normal ballpoint pen because water can enter the ink.