What primarily frustrated László Bíró and led to the invention?
Answer
The slow-drying ink used in newspaper printing stained his hands.
László Bíró, working as a journalist in Budapest, was frustrated because the ink used for printing newspapers dried quickly and did not smear, unlike the runny ink in his fountain pen, which routinely stained his hands.

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Invention of A Pen | The Dr Binocs Show | Peekaboo Kidz - YouTube
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