Half a croissant, on a plate, with a sign in front of it saying '50c'
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Magical latent image fruit knife

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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


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