What made the ink developed by the Bíró brothers effective for the new delivery system?

Answer

It was oil-based and thickened, flowing smoothly but drying rapidly on paper.

The brothers formulated a new type of ink that was oil-based and thickened. This ink was viscous enough to be controlled by the ball mechanism yet dried quickly upon contacting paper, preventing smearing.

What made the ink developed by the Bíró brothers effective for the new delivery system?

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

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