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Ripeness Sticker Coming to Supermarket Fruit

Adam Weiss writes "A biosystems engineering professor has just announced a "ripeness sticker" for fruit. According to this AP article, grocers throw out thousands of bushels of fruit a year because it ripens too fast (1 bushel is about 9 U.S. gallons). Mark Riley's RediRipe stickers turn from white to blue as fruit ripens. The stickers react with ethylene gas, a chemical which is released as fruit or vegetables ripen. However the article says "there are still bugs to be worked out: The stickers do not change color to reflect an overripe or rotten piece of fruit. Also, not all fruit produces enough ethylene to be detected by the sticker.""

25 of 321 comments (clear)

  1. Metric by CRCulver · · Score: 4, Informative

    ...1 bushel is about 9 US gallons...

    It would have been friendly of the editors to provide a metric equivalent for the large percentage of their readership outside of the United States. Running GNU units on 1 bushel tells me that it is just over 35 liters.

    1. Re:Metric by Anonymous Coward · · Score: 5, Insightful

      The conversions everyone is giving are useless.
      The original article never gave a measurement of the number of fruit thrown out it mearly stated "thousands of bushels", which is akin to saying "lots of fruit".

      I'm hoping lots isn't a unit of some sort or some slashdotter will try and convert it :P

  2. Fudged? by Tablizer · · Score: 5, Insightful

    Wouldn't businesses be tempted to fudge the stickers to sell more fruit? They use red die on meat.

    1. Re:Fudged? by ozmanjusri · · Score: 5, Informative
      It was carbon dioxide.

      Actually, they use carbon monoxide for that.

      --
      "I've got more toys than Teruhisa Kitahara."
  3. Thanks for the conversion by Frogbert · · Score: 4, Insightful

    Thanks for the conversion but why would you measure fruit in gallons or bushels? Perhaps some measure of mass would be more appropriate, say Kilograms, Pounds, Tons or Tonnes.

    1. Re:Thanks for the conversion by techno-vampire · · Score: 4, Informative

      Why do they measure fruit in bushels? It's simple: that's the traditional measurement in the US, and the article was written in the US for the US market.

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  4. Won't Work by DumbSwede · · Score: 4, Insightful

    And this will save grocers money how?
    Pay more for the stickers.
    Throw out more fruit as people only choose the least ripe.

    1. Re:Won't Work by Marcos+Eliziario · · Score: 5, Insightful

      Well... Think the other way: Even loving pineapple and mango, I never buy these fruits, because I am an incompetent bastard that never know if they are ripe enough to be eaten. After some experiences buying pineapples acid enough to make me cry, I stopped buying those fruits. So, I'd definitelly would buy more fruits if I had some way of knowing if they are already ripe.

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    2. Re:Won't Work by RajivSLK · · Score: 4, Interesting

      You should try pineapples again. I've noticed that the qaulity has drastically improved in the last three or four years. Probably the result of improved logistics and shipping.

    3. Re:Won't Work by Mike_K · · Score: 5, Informative

      Here's a trick I learned about buying a pineapple: try to pull out a leaf. If it comes out easily and at the base of the leaf, it's ripe. Otherwise, it's not.

      Enjoy sweet sweet pineapples!

      m

    4. Re:Won't Work by SCPRedMage · · Score: 5, Funny
      You want a pineapple that is heavy for its weight
      WTF?
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    5. Re:Won't Work by Scarblac · · Score: 4, Informative

      Actually, the result of genetical engineering (or at least, good old selective breeding). Wikipedia says:

      At one time, most canned and fresh pineapples were produced on Smooth Cayenne plants. Since about 2000, the most common fresh pineapple fruit found in U.S. and European supermarkets is a low-acid hybrid that was developed in Hawaii in the early 1970s.

      Look for brand names like 'Del Monte Extra Sweet Pineapple Gold' and you know you have the sweet version.

      --
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  5. What about nearby fruit? by brandorf · · Score: 5, Insightful

    So you have a pile of fruit, each with this sticker. If the chemical these stickers detect is a gas, how do I, the consumer, know that the sticker changed color because *this* fruit is ripe, and not the one next to it? If said fruit was tossed in a crate and shipped, would all the stickers turn?

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    1. Re:What about nearby fruit? by wjsroot · · Score: 4, Interesting

      maybe the sticker has the reative material on the underside and the color chaning material on above? two reactions?
      I'm not a chemical engineer but that sounds rather complex compaired with just picking up the food, looking at it, feeling if its firm, etc.

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    2. Re:What about nearby fruit? by profet · · Score: 4, Informative

      I've seen this technology before. The fruit was pears and they were sold in fours in a clear plastic packaging. The packaging was square shaped with each pear sitting in a corner. The top was domed and on the inside of the packaging was the sticker. I believe the discovery channel had a piece about this last year.

      Here is the video:
      VIDEO

    3. Re:What about nearby fruit? by kfg · · Score: 4, Informative

      The gas is actually a ripening agent. Its function is to make all the fruit in the same vicinity ripen at about the same time. Want your bananas to ripen faster? Stick 'em in a bag. The bag holds in the gas, which concentrates, quickening and syncronizing the ripening.

      Stick a fruit that's a bit riper in a crate? The others will start catching up, because of the gas released by the riper fruit.

      One bad apple. . .

      That's why they try not to do that when they pack 'em.

      KFG

  6. I'll just... by aniceyoungman · · Score: 4, Funny

    ...use the old-fashioned method, scratch and sniff.

  7. What about underripe fruit by LarsWestergren · · Score: 4, Informative

    Interesting, in Sweden just a day ago a newspaper reported that they had tested fruits and vegetables sold in Sweden with a refractometer, and out of 120 tests on produce sold in different stores, 64 were poor and 56 average, not a single fruit or veggie were "good" or "exceptional".

    The low Brix numbers measured indicate poor taste and nutrient levels, and are caused by too early harvesting, and speeding up growth with fertilizers and greenhouses (not enough time to accumulate nutrients from earth). Understandable, since this lowers risk for producers and allows them to ship long distances, for instance from New Zealand or Argentina. But consumers pay, because you need to eat more fruit and veg to get the beneficial effects, and they don't taste as well.

    Note that this newspaper is very pro-trade, pro-globalization and generally rightwing.

    --

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  8. whatever by Anonymous Coward · · Score: 5, Informative

    Anybody who buys fruit regularly can tell how ripe it is by touching it. I've been making a lot of smoothies this summer and I can pretty much tell what a banana, peach, or mango will taste like with a very gentle squeeze. I'm okay with tomatoes but it seems like they vary.. sometimes they are hard but ready to eat. (My girlfriend can explain.. just kidding).

    And actually, I don't see how this sticker will reduce the amount fruit the grocers have to throw out.

  9. Finally something I know about! by Sargeant+Slaughter · · Score: 5, Informative

    SO I;m probably one of the only people that visists this site that actually was a "journeyman" produce guy and have dealt with ordering and throwing out massive quatities of produce for various stores (Vons, Henrys, and Bristol Farms). Any good produce manager already knows what he's got in his cooler and how ripe it is, without some sticker to mislead him. Sometimes different fruit give off different amounts of gas at the same ripeness level depending on where it was grown, how long in it was in cold storage, etc... Since produce is in the USA is constantly coming in from all over the world, I don't think these stickers would be very reliable. Also I don't think the stickers would help much with waste because buyers over order on purpose when they can get a good deal. Buyers and district managers will push the dept managers to order more as well to get it outta the warehouse before it goes bad too. A lot of the time, (unlike other grocery items) produce sales (5 grapefruit for a dollar etc...) are based on availability of particular crops at good prices. THe buyer will order a crapload, the chain puts 'em on sale and hope that the product sells before they go bad. Cold storage can make some produce items last surprisingly long (several months sometimes) but a LOT of the time stores end up throwing out tons of the stuff, totally wasteful, but hey thats capitalism! I think the only thing these stickers would be good for would be to inform customers that don't know when their fruit is ripe. However, the afformentioned problems would still arise and it is doubtful that they would be very reliable. I think this was mentioned in the article, but don't know for sure cause I don't have time to read it - typical /. style ;-)

    --
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    1. Re:Finally something I know about! by Sargeant+Slaughter · · Score: 4, Funny

      Please don't wreck me for the formatting, I forgot how anal /. is... God, it's like a bunch of linux nerds run this place!

      --
      I hear and I forget. I see and I remember. I do and I understand. -Confucius
  10. Already done by onco_p53 · · Score: 4, Informative

    We have had this in New Zealand for a while now, the product is Ripe Sense invented by scientists at Hort Research New Zealand.

  11. Pears by sc0p3 · · Score: 5, Insightful

    Had these on Pears for years. They simply drive up the price of the fruit and add to the global plastic waste problem. The pears are packaged in packs of 4 in a plastic container.

    Just squeeze the pears for crying out loud.

  12. Do what now? by Rob+T+Firefly · · Score: 4, Funny
    The stickers do not change color to reflect an overripe or rotten piece of fruit.
    Luckily, the fruit itself still does. Do you really need science to tell you not to eat the dark brown apples or fuzzy green oranges?
  13. Quagmire version by Kris+Warkentin · · Score: 4, Funny

    Need one of these for girls:

    "18 yet? Let me check the sticker....Giggaty giggity gig!"

    --

    In Soviet Russia, hot grits put YOU down THEIR pants.