Pilot FriXion Gel Ink Pen Refill, 2-Pack for Erasable Pens, Fine Point, Navy Blue Ink (77326)

Pilot FriXion Gel Ink Pen Refill, 2-Pack for Erasable Pens, Fine Point, Navy Blue Ink (77326)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!