The clever boffins at Toshiba have come up with ‘a decolorable printing ink that is rendered invisible by heat treatment, allowing companies to reuse paper, to cut office waste and to reduce business costs.’

eBlue products include toners, inks, pens and a special ‘erasing’ machine.

It’s not consumer price cheap yet, so I don’t expect we’ll see anyone apart from dodgy ex-presidents buying it for personal use.

‘The chemical bonding of the dye and developer breaks down at temperatures around 140C(284F), which are generated during heat treatment by the erasing machine. The detached developer bonds with the decoloring reagent, the dye and developer separate, and printed images are erased.’ [via New Scientist]