How do erasable pens work? And why is the ink usually lighter than conventional ball and gel pens?
In: Chemistry
The ink is actually temperature sensitive, when it gets heated up, it becomes white, so when you erase, the friction from the eraser heats the paper and it becomes white
This is also why it looks lighter, because it has to turn white
Interestingly enough, if you put it in the freezer the ink that has been erased will come back
I once accidentally grabbed a frixion pen to sign a title over for a pickup. When the buyer put it on the hot black hood to sign his name, all my signatures vanished. The guy was like WTF?
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