Am 21.09.2012 09:15, schrieb Jaime Vives Piqueres:
> On 21/09/12 02:09, clipka wrote:
>> They are neither painted nor dyed, but rather treated with ethylene
>> gas, which triggers the natural change in color that would usually
>> accompany the ripening of the fruit in favorable weather conditions;
>> this works because ethylene is a natural hormone in plants that,
>> among others, regulates ripening of fruit.
>
>    After a little investigation, this seems to be the case, indeed...
> you're correct as usual. :)

:-)

To reveal a little secret of mine, that's only because I have the 
time-consuming habit of checking what I'm writing about (sometimes to 
find that I'm actually completely wrong and need to re-write the whole 
posting), so often my postings are more of a digest from Wikipedia pages 
than what I had previously thought to known :-)

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Le 21/09/2012 09:01, Jaime Vives Piqueres nous fit lire :
> On 20/09/12 22:57, Alain wrote:
>> Very nice... except that ripe Valencia oranges are actualy green.
>> They start green, turn orange, then turn back to a particular dark
>> green once fully rippened. They are dyed orange before been sold.
> 
>   Hmmm... I'm not really an expert, so I don't know for sure, but I'm
> surrounded by millions of orange trees and never seen this, or heard it
> referred. To my knowledge, oranges just start green and turn orange.
> People here traditionally collected them at that point, but due to
> markets, today they collect them much sooner, when they are still a bit
> green (or so says my mother, who worked as harvester when she was young).
> 
>   Personally, I *always* eat non-market oranges, picked directly from
> the tree (some friends and family members have their own orange fields)
> or purchased directly to the field owner in front of their house:
> 
> http://farm8.staticflickr.com/7063/6820027554_1a5fb41634_z.jpg
> 
>   No dying here, they are sold as they come out from the tree... but
> perhaps it is true for oranges marketed to distant places, as they are
> picked still green.


A bit of extra:

Ethylen gas is used as documented by other posters.
And for extra conservation, citrus fruits (lemon, orange, grapefruit...)
can also be waxed.
The purpose of the wax is to keep the water inside, so the fruit seems
fresh far more time. And it make the fruit shiny.
Extra bonus of waxed fruit, for the seller: as they keep their water,
they weight more on the long run than a natural old fruit; It's
important when you deal the fruit by the weight (if you want money).

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Jaime Vives Piqueres <jai### [at] ignoranciaorg> wrote:
> On 18/09/12 21:27, Stephen wrote:
> > And burn your name into the box. ;-)
>
>    Done!  ...tough not my name, but a fictitious company.
>

Nice one, Jaime! The grass is a welcome departure from most other CG lawns: it
appears to have some history to it. The oranges lose some realism due to their
ends having the pinched appearance of either cylindrical or spherical mapping,
but otherwise they look pretty good :)

Sam

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On 22/09/12 20:46, Samuel Benge wrote:
> Nice one, Jaime! The grass is a welcome departure from most other CG
> lawns: it appears to have some history to it. The oranges lose some
> realism due to their ends having the pinched appearance of either
> cylindrical or spherical mapping, but otherwise they look pretty
> good :)

   Thanks, Sam...  the grass is just a simple and dirty trick, but works
fine. I first used a simple image map with a grass picture from
mayang.com, but obviously this looked too flat at most angles. It just
occurred to me that I could add scattered mesh-blades to dissimulate the
problem while benefiting from the realism of the image map. This worked
because I used the same image map as source for the blades green tones.

   And yes, the ends of the "isorange" are not very well done: when I
modeled these for a still-life years ago, they were always resting on
its end, so I never got to see the problem until now... :(

--
Jaime

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