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
Linguistic relativity and the color naming debate of concrete evidence for its existence. Saunders is also bothered by the overall de-contextualization of color terminology and the failure of universalists to address the limitations of their methodologies. She points out that: "Ordinary colour talk is used in a variety of ways – for flat coloured surfaces, surfaces of natural objects, patches of paintings, transparent objects, shining objects, the sky, flames, illumination, vapours, volumes, films and so on, all of which interact with overall situation, illumination, edges, textures, patternings and distances, making the concept of sameness of colour inherently indeterminate". John A. Lucy's criticisms of Berlin and Kay's theory