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
Colour guard carry the M1, M-16, FN FAL or Pindad SSD-1 rifle while the colour officer carries his/her sabre. Composition of the Indonesian colour guard unit The Dutch armed forces have similar ranks corresponding to a colour guard, the "vaandrig" and "kornet" (aspirant officers who have not been sworn in yet). Russian colour guards are composed of: Active units, military academies, and guards of honor carry sabers in the color guard, if needed, rifles may be substituted. The same design is used for color guards in countries of the CIS. If there are multiple color guards marching in a parade at the