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After becoming frustrated with fountain pens' inability to mark up leather, he decided to take the matter into his own hands.
Bíró was inspired to create the modern ballpoint pen after noticing that the ink used in newspapers dried much faster than that used in traditional fountain pens.
He determined that a pen equipped with newspaper ink would not smudge as easily as one that used fountain pen ink.
But, when Bíró tried to fill a fountain pen with the quick-drying ink, he discovered that it was far too viscous to flow through the nib.
While fountain pens often leaked and exploded at high altitudes, Bíró's pen was much more stable and functional aboard an aircraft.
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