The cross between a Roan Black stallion, whose coat the (Rn) gene acts on the base coat by distributing white hairs throughout the body, giving it a roan appearance. The head and legs retain the original base color tones. Entirely black coat, with no dilutions and no Agouti gene action restricting black pigment to the points., and a Grullo mare with coat the Dun gene acts on the base color, adding the characteristic dark dorsal stripe. In some cases it lightens the body tone and may also produce zebra-like leg markings. Entirely black coat, with no dilutions and no Agouti gene action restricting black pigment to the points., can produce 8 different coat colors: Roan Dun Black (22%), Grullo (22%), Roan Black (22%), Black (22%), Roan Dun Chestnut (3%), Dun Chestnut (3%), Roan Chestnut (3%) and Chestnut (3%). Results vary according to the genotype of each parent — use the filters above to explore specific combinations.