If you cut an apple in half and leave it for a bit, it goes brown. You can stop it turning brown with lemon juice. So, this idea is for a knife with inkjet printer nozzles inside the blade which can apply an image in lemon juice to the inside of an apple as you cut though it. So, the effect is that you cut through an apple and an image slowly emerges as the non-lemon-juiced bits turn brown.
-- hippo, Nov 17 2014

You could use something like this for all sorts of creepy effects. Figure out who packs the lunches for ISIS and send them messages from Allah, like Mohammad with a bomb in his turban, eating 72 raisins in hell or somesuch...
-- RayfordSteele, Nov 17 2014


You know, nobody ever said those 72 virgins were female.
-- doctorremulac3, Nov 17 2014


Or even human. They might be camels, for example.
-- Vernon, Nov 17 2014


Here hippo gave this nice image of a magic apple, and all you have to talk about is beheadings?
-- pashute, Nov 17 2014


At least I understand this idea. A bun just for that. And I like it. Though apples don't usually sit around on my counter long enough for the "real" show to begin.
-- blissmiss, Nov 17 2014


Great idea with a ridiculous method. Maybe if the blade had a turning /rolling belt with an image in the center so that when the blade pierces the skin the belt starts to roll as it enters the apple, depositing acidic juices on the surfaces.
-- rcarty, Nov 19 2014


That might work better - another alternative approach would be to have a matrix of tiny heating elements in the blade.
-- hippo, Nov 19 2014


+ wonderfully halfbaked. It would also be nice to cover the entire slice to prevent it from turning brown, but that might be too practical!
-- xandram, Nov 19 2014


Excellent, we could try with some stencils to see the effect meanwhile
-- piluso, Nov 19 2014


Would this work for beheadings too?
-- MaxwellBuchanan, Nov 19 2014


Not sure a fruit knife is big enough.
-- pocmloc, Nov 19 2014


Depends on how patient one is, surely?
-- MaxwellBuchanan, Nov 19 2014


Either very patient or mental patient should suffice.
-- rcarty, Nov 19 2014


//Magical latent image fruit knife

Magical lateen image fruit knife might suit the more nautical types...got stopped by the police apparently cos I was wearing sandals on a cold and rainy day.
-- not_morrison_rm, Nov 20 2014


//They might be camels //

That's not necessarily a bad thing ...
-- 8th of 7, Nov 22 2014



random, halfbakery