What makes blue the most popular pen color? - Quora
What makes blue the most popular pen color? - Quora
Answer (1 of 19): You did not really specify why is blue used for the body of the pen or the ink, but since someone already covered the ink, let me try to cover the body of the pen. Blue is one of the most common favorite colors for humans. So since the idea of producing pens is to sell as many o
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