Half a croissant, on a plate, with a sign in front of it saying '50c'
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Grape converter

Desiccant box turns grapes into raisins.
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The desiccant absorbs a lot of water. If you take too long using the grapes, they become raisins. Works in frig or out.

Will just be too big and clunky a box, if your talking a large bunch, but one or a few might work.

popbottle, Nov 05 2014

how do they https://www.youtube...watch?v=7e8DepWX4_4
make raisins? [popbottle, Nov 05 2014]

Dehydrators. Dehydrators everywhere. http://www.ebay.com...ators-/32883/i.html
Some are even boxlike. [Custardguts, Nov 05 2014]

[link]






       But grapes cost more to buy than raisins, so wouldn't you want something that would transform raisins into nice, plump, juicy grapes, that you could sell for a profit? Hmmm...
blissmiss, Nov 05 2014
  

       Or even better, convert raisins into wine.
hippo, Nov 05 2014
  

       Or even better, compress grapes to make purple diamonds!
xandram, Nov 05 2014
  

       //nice, plump, juicy grapes   

       Suspect Botox costs might drag down the profit margin. No relation to the Water Margin, marginalia et al.   

       Howcome this isn't entitled grape expectations...
not_morrison_rm, Nov 05 2014
  

       //Howcome this isn't entitled grape expectations...//   

       I'm seeing your pun and raisin' you one.
MaxwellBuchanan, Nov 05 2014
  

       Currantly, that's the best pun, or at least the currant pun. But it might be possible to prune it a bit …
8th of 7, Nov 05 2014
  

       Unless there's some hidden humour or pun I'm missing here, you're describing a dehydrator (but an innefficient one).   

       Most dehydrators use forced slightly heated air to dehydrate foodstuffs (like jerky, fruits and vegetables etc). They are cheap and reliable and are extremely common.   

       Your description says to use a dessicant. Which would be incredibly innefficient, firstly because without forced airflow it would be a very slow process, and secondly the dessicant would need to be regularly replaced or rejuvenated. Rejuvenating the dessicant would require either heat, or exotic solvents.   

       ...An electric dehumidifier just shortcuts that by not using dessicant at all.
Custardguts, Nov 05 2014
  

       If you look at the first link, you will see that they manipulate the grape vine into becoming the dehydrator. The sun drys them over several weeks.   

       I guess I don't like grapes that much because they start to mold or worse by the time I get to the bottom of the bag. So I was just trying to make my refrigerator do the drying instead of the rotting.
popbottle, Nov 06 2014
  

       Ah, didn't click the link as I can't youtube from here.
Custardguts, Nov 06 2014
  

       Hmm, what not include a plastic bag with the raisins, containing the water from the drying out stage? Let the consumer decide.
not_morrison_rm, Nov 06 2014
  
      
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