"The Fischer-Saller Scale, named after Eugen Fischer and Karl Saller, is used in physical anthropology and medicine to determine the shades of hair color. The scale uses the following designations: A to G (blond), H, J (blond brown), K to V (brown), W (brown black), X, Y (black) and Roman numerals I to V (red) and VI (faint red).[1][2]" - http://en.wikipedia.org/wiki/Fischer%E2%80%93Saller_scale