Human hair color used in physical anthropology and medicine to determine the shades of hair color. The scale uses the following designations: A (very light blond), B to E (light blond), F to L (blond), M to O (dark blond), P to T (light brown to brown), U to Y (dark brown/black) and Roman numerals I to IV (red) and V to VI (red blond). Brown hair is characterized by higher levels of eumelanin and lower levels of pheomelanin. Of the two types of eumelanin (black and brown), brown-haired people have brown eumelanin; they also usually have medium-thick strands of hair. Brown-haired girls
Shades of gray metallic" was formulated in 1999. The color displayed at right matches the color sample called "taupe" referenced below in the 1930 book "A Dictionary of Color", the world standard for color terms before the invention of computers. However, the word "taupe" may often be used to refer to lighter shades of taupe today, and therefore another name for this color is "dark taupe". The first use of "taupe" as a color name in English was in the early 19th century. Shades of gray Variations of gray or grey include achromatic grayscale shades, which lie exactly between white and black, and