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Types of Blood Gel Pen Pack Apparel vintage-inspired illustration of the humanDid you know not all blood is red? From blue blood in octopuses to green blood in lizards, the world of blood is as diverse as life itself. The Types of Blood Gel Pen Pack lets you write in the colors of blood found in creatures around the globe. With six vibrant gel pens named after different types of blood, this set is perfect for science enthusiasts and creative minds alike. Why You'll Love These Science Inspired Gel Pens: Explore a Rainbow of