I have a blue roan cow that I bred to a dun roan bull-he's a Levi 6 son (Roundup grandson) and she had a blue roan bull calf last Sunday. He's white with black ears, feet and nose. He has black hairs all through his coat. He'll be speckling up really soon. To me that's one of the pluses of the breed-one thing about it, you don't get bored looking at them. I believe it was J. Frank Dobie who described them as having more colors than the rainbow.
Here's a list of colors/combinations and variations that a Longhorn can be. This is listed on the TLBAA site:
Description Word List
above, across, and, ankles, around, back, bald, base, behind, belly, below, belt, between, black, blaze, blonde, blue, body, both, bottom, brindle, brisket, bronze, brown, buckskin, by, cape, cast, center, chest, chin, circle, circles, color, colored, cream, crest, crown, dark, dewlap, diamond, dirty, down, dun, ear, ears, end, eye, eyebrow, eyebrows, eyed, eyes, face, faced, fawn, feet, few, five, flank, flanks, flecked, flecks, foot, fore, forehead, foreleg, forelegs, four, freckles, from, front, frosted, golden, gray, grey, grulla, hair, halfway, head, heart, hind, hindleg, hindlegs, hind-quarter, hip, hips, hocks, horn, horns, hump, in, inner, inside, irregular, jaw, knee, knees, knot, large, left, leg, legs, light, line, lineback, lines, loin, long, lower, marking, markings, maroon, mealy, medium, midway, mixed, moon, mottled, mouth, mulberry, multi, muzzle, narrow, navel, neck, nose, of, on, one, orange, outer, over, paint, parker brown, patch, patches, pink, points, poll, purple, quarters, rear, red, ribs, right, ring, roan, rose, rump, rust, seven, shallow, shank, shield, shoulder, shoulders, side, sides, silver, six, slash, small, socks, solid, some, smokey, speck, speckled, specks, splotch, spot, spots, spotted, star, streak, streaked, streaks, stripe, striped, strips, switch, tail, tan, tawny, the, thigh, thighs, three, throat, tip, tips, to, top, topline, tri, triangle, trim, two, udder, under, underline, v, white, wide, with, withers, yellow.