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 cyan in the 1860s (exact year uncertain). "See Cyan in human culture in the main article on Cyan." If the visible spectrum is wrapped to form a color wheel, cyan (subtractive primary) appears midway between blue and green: Shades of cyan This article is about notable tints and shades of the color cyan, a greenish blue. Cyan is one of the subtractive primary colors- cyan, magenta, and yellow. The first recorded use of "cyan blue" ("cyan blue" was the name used for the color "cyan" in the 19th century) as a color name in English was in 1879. In color printing,