Thank you for getting back to us. We are so pleased to hear you managed to remove the FriXion marks.
We actually contacted HQ regarding this issue.
They came back to us with the following:
"About this matter, this is not because the ink has re-colouring, but because the direct sunlight has hit the area where the writing was done with Frixion, causing the transparent ink to deteriorate and turn brown under UV light.
Frixion ink is only "transparent" to begin with, but it is not completely erased. The ink remains on the spot. The residual ink deteriorates under ultraviolet light and turns brown.
Additionally, originally, frixion inks are not highly light resistant. We urge retailers and end-users to refrain from displaying, using and storing them in direct sunlight.
This is not only because of the risk of colour fading at temperatures above 60°C, but also because the products are not lightfast.
Paper and cloth alike will deteriorate over time and become brownish in colour when exposed to direct sunlight. Frixion is mainly intended for use on notebooks and diaries and is not intended for use on items that may be exposed to direct sunlight. You can continue to use Frixion for embroidery, but please be careful placing your work in direct sunlight."
We hope this information is more useful.
Kind regards,
Pilot Pen UK Marketing
