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
Indian red (color) Diderot in 1765, alternate names for Indian red included "what one also calls, however improperly, English Red." The source of this color is: ISCC-NBS Dictionary of Color Names (1955) – Color Sample of English Red (color sample #15). At right is displayed the color kobe. The color "kobe" is a dark tone of Indian red, made like Indian red from iron oxide pigment. The first recorded use of "Kobe" as a color name in English was in 1924. Indian red (color) Indian red is a pigment composed of naturally occurring iron oxides that is widely used in India. Other shades