Types of Blood Fine liner Pens Pack

 Did you know that not all blood is red? While most vertebrates (like humans) have red blood, octopuses and crustaceans have blue blood, leeches and some segmented worms have light green, lizards have green, some marine worms have violet, and sea cucumbers and some beetles have yellow! 

Write in the rainbow of blood colors with this fineliner 6-pack.  .4 mm tips  Each pack contains 6 unique colors: Hemoglobin  Hemocyanin  Chlorocruorin  Hemerythrin  Vanabin  Biliverdin