Dr. Neitz, who conducts his research with his wife Maureen, said only women have the potential for super color vision.

A tetrachromat has another type of cone in between the red and green (somewhere in the orange range) and its 100 shades, theoretically, would allow a woman to see 100 million different colors.

It was not a color most women would wear, but it brought out the reckless gleam in her long straight hair and the green of her eyes.