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 green 2005 it formalized the colors which it would use. The color "screamin' green" is shown at right. This color was renamed from "ultra green" by Crayola in 1990. This color is a fluorescent color. "Sea green" is a color that resembles the sea floor as seen from the surface. "SGBUS green" is the color voted by the public and used by Singapore to colour all its government-owned public buses. "Spanish green" is the color that is called ""verde"" (the Spanish word for "green") in the "Guía de coloraciones" ("Guide to colorations") by Rosa Gallego and Juan Carlos Sanz, a color