Total of 9 refills : The technology used in FriXion erasable gel ink pens has been in the making for more than 30 years. Vibrant Autumn leaves inspired a Pilot researcher to capture the same dynamic color change in a test tube. A special formulation that would vividly change color at different temperatures was developed. The unique color-changing technology was initially used to create children s toys. Several years later, another Pilot researcher modified the formulation to create disappearing ink-and FriXion erasable gel ink pens were born!
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