These pens
use thermo sensitive ink - in other words, a type of ink that responds to temperature.
The integrated eraser isn't a typical eraser but the action of rubbing it over the ink creates heat due to friction (hence the name) which causes the ink to disappear from sight.
Several years ago we organised an activity with one of the year groups at one of our local primary schools. In fact, it was the primary school Richard attended (more years ago then I dare tell you!). The children were asked to write out a poem in their best handwriting, in exchange for which they received a free Frixion pen. We demonstrated the way the ink responded to heat by writing "Watch this ink disappear" on a sheet of paper and then laminating it. The ink duly disappeared before their eyes - magic(?)!
Particularly popular with children, these pens are also popular with adults and for those conscious about their carbon fooprint, we carry stocks of refills
in black, blue, red, green and purple. The range is also complemented by a selection of highlighters.
Finally, for those of you who live nearby, a reminder that, as well as collecting ink cartridges for recycling, we also collect pens, pen refills, felt pens, highlighters, marker pens, mechanical pencils, fountain pen ink cartridges, correction instruments and correction fluid bottles for recycling. The ink cartridges are delivered to a representative of one of the local Rotary Clubs, who then exchange them for a donation for charity. The writing instruments and other bits are taken to Greatwood Primary School here in Skipton for their recycling programme which is supported by BIC.