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Amazon.com: Zebra Sarasa Retractable Gel Ink Pens, Medium Point 0.7mm, Bulk Combo Pack of 6 BLUE Gel Pens & 6 BLACK INK Zebra Gel Pens (Black/Blue) : Office Products
Why do we mostly use blue inked pens to write when black ink serves a better contrast to white paper? - Quora
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