Half a croissant, on a plate, with a sign in front of it saying '50c'
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ripened fruit notice/alarm

to remind you to eat the fruit that would otherwise go off
  (+3, -1)
(+3, -1)
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against]

an alarm, with a timer to set off an alarm at the time when the fruit should[is reckoned to] be ripe (or with a mechanism for detecting just ripe fruit) that shouts in different fruit voices/accents/with names[to tell apart which fruit was ripening] about 'hey! dont forget us oranges!'
technobadger, Nov 15 2001

Information on exotic fruit ripeness http://asiarecipe.com/fruit.html
Includes which fruits ripen, and general tips for gauging ripeness. [pottedstu, Nov 15 2001, last modified Oct 04 2004]

Advice on some common fruit and veg http://www.keagyspr...com/tips_hints.html
[pottedstu, Nov 15 2001, last modified Oct 04 2004]

Summer fruits http://www.fabulous...tips/fruittips.html
[pottedstu, Nov 15 2001, last modified Oct 04 2004]

(?) Choosing fruit and veg http://www.bhg.com....22_Article_FruitVeg
For quality and ripeness [pottedstu, Nov 15 2001, last modified Oct 04 2004]

Ripeness Sensor http://www.gizmag.com/go/3575/
RipeSense labels don't send off an alarm, but they do provide a visual alert to a piece of fruit's ripeness. [jurist, Jul 29 2006]

RediRipe Sticker http://www.azstarnet.com/news/139457.php
Sensor label turns from white to blue. [jurist, Jul 29 2006]

[link]






       "Mind the oranges, Marlon!"
jutta, Nov 15 2001
  

       Hmmm. One could put a weight atop the subject fruit whose weight is precisely chosen to flatten said fruit when it became too ripe. As the weight falls, it trips a small bell to let you know that your banana is past its prime.
bristolz, Nov 16 2001
  

       Some fruits give out ethylene when ripe (e.g. apples), so this could be used in a chemical detector. Probably the best thing to tell if fruit is ripe would be a picture book with examples of ripe and unripe fruit of each sort. Meanwhile, in my capacity as an ex-greengrocer, I've linked to some advice for you. The first link is the most general, and tells lots of stuff about the ripening process from a non-technical point of view.   

       I think I have the same problem as [technobadger] though, in that I buy fruit that isn't ripe yet, and then I forget about it until it's turned to mush.
pottedstu, Nov 16 2001
  

       Eddie Izzard did a sketch on this subject. Pears have a useful lifespan of around 4 seconds, during which period they go from rock-hard to pile-of-mush.
angel, Nov 16 2001
  

       Well, avocados are evil, unless you like the taste of soap.
bristolz, Nov 16 2001
  

       Somehow, I doubt that soap would be a good substitute for avocados, to be mashed, mixed with onion, cilantro, sea salt and paprika, and served over warm tortilla chips with refried beans and cheese.
Guncrazy, Nov 16 2001
  

       Well, Guncrazy, I didn't say that soap was a good substitute but I'm betting that mashed and mixed, warmed and served, it would taste about the same as the avocado and probably better than avocado mixed with cilantro.
bristolz, Nov 16 2001
  

       I happen to love avocados. Respect my green brother.
chupacabra, Jan 26 2002
  

       Cilantro tastes like soap to me...but I'd rather have it than avocados or their pre-eaten appearing form guacamole...
StarChaser, Jan 27 2002
  
      
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