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The link dip pen and fountain pen, which were the standards for correspondence for much of the 20th century, use a slow-drying water-based liquid ink and if your pen is link in your left hand, and you're writing left to right, your hand will smear the letters as fast as you can make them. This did not start to become a non-problem until Lazlo Biro invented the ball-point pen, which was popularized by the success of link the Reynolds ball-point pen.