Human hair color account for all possible shades of brown, blond, or red (for example, platinum blond versus dark blond/light brown), nor does it explain why hair color sometimes darkens as a person ages. Several gene pairs control the light versus dark hair color in a cumulative effect. A person's genotype for a multifactorial trait can interact with the environment to produce varying phenotypes (see quantitative trait locus). Natural hair color can be brown, blond, black, red, or white; all natural hair colors including grey, white and lightest blond, are shades of brown. The Fischer–Saller scale, named after Eugen Fischer and , is
Shades of Grey Shades of Grey Shades of Grey: The Road to High Saffron (2012, simply titled Shades of Grey originally) is a dystopian novel, the first in the "Shades of Grey" series by novelist Jasper Fforde. The story takes place in Chromatacia, an alternate version of the United Kingdom wherein social class is determined by one's ability to perceive colour. Chromatacia is a future dystopian society that exists at least five hundred years (although possibly more) after the collapse of our own society, identified as 'the Previous'. All life is governed by the laws set by Munsell, the supposed and revered founder