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 green dictionary published in 2005 that is widely popular in the Hispanophone realm. UNT green is one of three official colors used by the University of North Texas. It is the primary color that appears on branding and promotional material produced by and on behalf of the university. At the right is one of the official colors used by the University of the Philippines, designated as "UP forest green". It is based on the approved color specifications to be used for the seal of the university. Shades of green Varieties of the color green may differ in hue, chroma (also called