Bíró’s ink was oil-based, and sat on top of the paper rather than seeping through the fibers. While gravity and pen angle had been a problem in previous designs, his ink induced capillary ...
This multi-functional EDC tool redefines what a pen can do and is 40 percent off this week. Constructed from a state-of-the-art metal alloy ... endlessly without ink refills or charging.
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