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 Shades of gray Variations of gray or grey include achromatic grayscale shades, which lie exactly between white and black, and nearby colors with low colorfulness. A selection of a number of these various colors is shown below. Below is a chart showing the computer web color grays. An "achromatic gray" is a gray color in which the red, green, and blue codes are exactly equal. The web colors "gray", "gainsboro", "light gray", "dark gray", and "dim gray" are all achromatic colors. A "chromatic gray" is a gray color in which the red, green, and blue codes are not exactly equal,