Young russet kittens have colour and markings comparable to tabby kittens except for the tail-tip, genital area and fur around the paw pads. As the kitten grows, black pigment areas become redder, starting at the head. On the backside surfaces, fur with red pigments develops gradually. Melanin is also reduced in the bottom half of the hair closest to the skin. Mature cats are reddish all over with some black pigment in the undercoat which varies between individuals.