Why isn't this available? Or is it?
"I printed that obscene e-mail message that gt sent yesterday before I deleted it. Now where is it? All I can find is these blank sheets..."-- globaltourniquet, May 25 2002 US8328317 https://patents.goo...om/patent/US8328317cites this idea as prior art [xaviergisz, Oct 31 2018] Remove the fuser. The toner still won't disappear by itself, but the more the printout is handled, the less you'll be able to read it.
You could also print on black paper, but you wouldn't get the same effect.-- phoenix, May 25 2002 Where I work we remanufacture old toner cartridges for sale. The only way I could think to do it would be to change the formula of the Toner (ie, remove a lot of the phosphates) so that the Toner would be very sensitive to light and fade. I don't know how long it would take. Maybe about 6 months to a year. That's how the invisible inks work anyway.-- thelumberjack, May 26 2002 If memory serves me . . . The KGB had a really good disappearing ink for pens and such. If conditions were good, it would slowly fade from black to invisible in about a week. Possibly it could be adapted to work for toner too.-- Mr_Thundercleese, May 27 2002 If memory serves me . . . The KGB had a really good disappearing ink for pens and such. If conditions were good, it would slowly fade from black to invisible in about a week. Possibly it could be adapted to work for toner too.-- Mr_Thundercleese, May 27 2002 At this point Mr Thundercleese fell into time vortex, doomed to all eternity..-- not_morrison_rm, Oct 31 2018 Or did he just ‘disappear’?-- AusCan531, Oct 31 2018 No, he was definitely seen being assisted into a black helicopter by two burly men wearing sunglasses.-- 8th of 7, Oct 31 2018 //by two burly men// You never see anything else described as "burly", do you? I mean, you don't get burly furniture; an overfilled sandwich is never burly; it's always and only "men".-- MaxwellBuchanan, Oct 31 2018 A service that swaps your, your boss's, and your SO's toner with this upon the consumption of more than a set amount of alcohol or Ambien.-- Voice, Nov 01 2018 random, halfbakery