Rat Varieties Base Colors Black is a/a Agouti is A/a or A/A All rats are one or the other, and this is the base of their color. The albino gene overrides this, however. Black SILV Medusa, a black doe Agouti SILV KitKat, an agouti dumbo doe Siamese Seal point Siamese SILV Jameson, a seal point Siamese dumbo buck Agouti point Siamese Marten cm/- Marten SILV Icarus, a marten buck (he is actually pointed marten, ch/cm, but he works for illustrative purposes.) Silver agouti Burmese c/c Bu/bu, c/ch Bu/bu, ch/ch Bu/bu Burmese SILV Patrick, a Burmese buck Pearl Pe/pe on mink Pearl SILV Dorian Gray, a pearl buck Cinnamon Pearl SILV Pumpkin Pie, a cinnamon pearl doe