From: psperson@old.netcom.invalid
On Sun, 22 Feb 2026 03:57:09 -0000 (UTC), Lawrence DŽOliveiro
wrote:
>On Sun, 22 Feb 2026 03:31:03 -0000 (UTC), quadi wrote:
>
>> Also, it might be relevant to mention that there are women who walk
>> among us who see a whole different and vaster universe of color than
>> everyone else. That's because the genes for the pigments in the
>> cones of the eye are on the X chromosome, so a woman one of whose
>> parents is an anomalous trichromat (a kind of color blindness) could
>> have the three normal cone pigments plus the anomalous pigment in a
>> fourth kind of cone.
>
>I have heard about such. One such tetrachromat woman had a successful
>career as an interior decorator. Apparently her talent was in
>distinguishing extra shades of ... beige.
IIRC, steel mills once employed men who could see the /exact/ color at
which the steel should be poured. Most could not see that many shades.
Their sons often had the same talent.
Modern steel mills no doubt use some form of equipment to detect when
the proper temperature is reached.
>Conversely, I have heard of cases of colour-blindness being cured by
>the wearing of specially-designed glasses. I suspect the sufferers
>were not true dichromats, it was just their misfortune to have colour
>receptors with peak sensitivities too close together in the spectrum.
>So I think the special glasses were basically filters to magnify the
>difference in stimulation between those different receptors.
--
"Here lies the Tuscan poet Aretino,
Who evil spoke of everyone but God,
Giving as his excuse, 'I never knew him.'"
--- SoupGate-Win32 v1.05
* Origin: you cannot sedate... all the things you hate (1:229/2)
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