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
Natural Color System lightness value "v" as the sample on the reference scale to which it has the least noticeable edge-to-edge difference. Two examples of NCS color notation—the yellow and blue shades of the Swedish flag: The NCS is represented in nineteen countries and is the reference norm for color designation in Sweden (since 1979), Norway (since 1984), Spain (since 1994) and South Africa (since 2004). It is also one of the standards used by the International Colour Authority, a leading publisher of color trend forecasts for the interior design and textile markets. In order to be able to manufacture physical representations of