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<p>[QUOTE=&quot;desertgem, post: 1509113, member: 15199&quot;]OK, I hate to tell this to a mainly &quot;masculine&quot; audience, but it is a verified scientific fact and is genetic. I refer you to Discovery magazine , Jul-Aug, 2012.</p><p><br /></p><p>The traditional view of color vision ( I taught it in college for many years) is that humans have 3 types of cells that distinguish color ( cones). It has been known that deficiencies in these cells lead to a variety of colorblindness. Now they have found that there is a 4th type of cone, distinguishable in the retina of females ( no known males have it) . When 25 females having the cone were tested however, only one was able to use the extra color vision. A computer generated 3 colored circles, which males and inactive gene females saw as the same each time. But on a random basic one circle was not pure, but had a small percentage of red or green added to it. The one female got 25/25 correct. They estimate that she can see 100,000 to 1,000,000 more shades of colors than&nbsp; males or untrained females with the extra cone. The title of the article is &quot;Super Human Vision&quot;. When pearl grading was done by humans as to color shades, the graders were women whoi had trained for it. Men couldn&#039;t do it, tell the over 1000 shades of white required.</p><p><br /></p><p>So TPG should train superhuman vision women to grade toned coins, and tone loving collectors should train their female partners and family to pick the best toning <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /> Women when trained would also tend to be best color experts in art, design, clothing determination. Men and most women are trichromats, but some women are the super &quot;tetrachromats&quot;.</p><p><br /></p><p>To put it into perspective, trained tetrachromats could see the full color range, whereas males and untrained possible women tetrachromats would be seeing like current red-green colorblind males do, a big loss of color sensory input. None of the men or women of the experimental team could pass the test, so they could not express what the extra colors look like. Nor could the 1 woman. How can you describe red to someone who has never seen &quot;red&quot; ? </p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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