Have you watched the ball-point pen
which disappeared of the ink?
It is not a mechanical pencil.
This is special ink.
Ink does not really disappear.
It does not seem that I exceed 65 degrees centigrade
and consider it to become -20 degrees centigrade and come to obtain it.
Therefore a line disappears by the frictional heat
when rub it with the head of the pen.
The ink can erase even if warm it with a hair dryer.
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