 Further dividing the varieties of fancy rats are the many different markings . Pet rats can appear in any combination of colors and markings . The markings are typically in reference to the patterns and ratios of colored hair versus white hair . Two extremes would be a self ( completely solid , non @-@ white color ) and a Himalayan ( completely white except blending into colored areas at the nose and feet , called points , as in a Himalayan cat 's markings ) . 
