Uni Erasable

Erasable pens used to be pretty bad - if your experience of them is from some time back, it might be time to give them another go. These are different, using ink that changes from coloured to clear when heated, and the rubbing of the hard 'eraser' on the end of the pen generates enough heat from friction to do the job.

Note that the erased ink can be brought back in a faded form by getting it cold enough, so don't use these for anything that has to stay secret!