how do erasable pens work?
In: 3
It depends on the brand, since there are several methods. The most popular method (the one used by [this brand](https://images-na.ssl-images-amazon.com/images/I/91kgpsYZI7L.jpg)) uses and ink that changes its chemical structure with heat. It goes from a color to being transparent when heated, then remains that way until cooled well below the original temperature. The “eraser” is just a rubber nib meant to generate friction. If you erase this kind of ink, then put the paper in the freezer, the ink will reappear.
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