Labradors are registered in three colors: solid black color (white spot on chest is permissible), yellow (ranging from white or light cream to fox-red), and chocolate (medium to dark brown). Pigmentation is visible at the nose, lips, gums, feet, tail and the rims of the eyes and may be black, brown or liver. Labs can carry genes for a different color, e.g. a black Labrador can carry recessive chocolate and yellow genes. Yellow Labradors have black noses that gradually turn pink with age as a result of of cold weather and reduced pigment production from two years onwards.