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Its like sabino's too, they get registered as roans.

I wikied the horse colors, heres one thing it said. A grullo horse is a dun with a black base, rarer than red duns or bay (classic) duns. Only 0.7% of quarter horses registered each year with the AQHA are grullo. There are several variations of grullo, informally referred to as black dun, blue dun, slate grullo, silver grullo, silver dun, or lobo dun. However, all of these shades are genetically based on the same thing; the dun gene on top of a black gene."
Here's another thing "The word grullo originates from the Spanish word "grulla", which refers to a slate-gray crane. Because of the Spanish origin of the name, some people will refer to a mare as a grulla and a stallion as a grullo, pronounced "grew-ya" and "grew-yo" respectively." "The most obvious way to tell a grullo is not only the gray or tan-gray shading, but also its primitive markings, which include some or all of the following: dark face; cobwebbing around the eyes and forehead; dark mottling on the body; leg barring (sometimes called tiger striping); dark ear tips and edging; dark ear barring; dark shadowing of the neck; dark dorsal and transverse striping; dark mane and tail guard hairs."