How do you know if the ball point pen's ink is erasble with a regular eraser? See detail.
That is without having to test it with an eraser. Have you seen a pen that says anything about it? And what would be the term for it, since it’s not the pen that’s being erased but the ink. And it’s not the ink from pre ball point pen era. And why is there such a product? Could it be a defective batch?
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