I would need to see, when you say gray. The wool is gray? The coat on my black buck is nearly white at the tips, the fiber has never been black. I got him at 12 weeks. The longer it grows out, the lighter it gets. I sheared the first coat, so what came in was much lighter than that one, and at the end of August, when he blew that coat, the fiber was white to the roots, and only now, am I getting an actual black coat.
If there heads are black, they are black, the cycle of fiber growth will determine how dark the wool is, as the follicle only produces so much color, then when the wool is released, the color comes in again. Not sure if I am explaining it right, but it's the reason why non molters only get one show coat, because the color is never as dark as the first coat.
Because my buck keeps his coat for so long, I have to go through several cycles before I see the black color again. If the coat had not blown in August, the natural cycle would have been almost 8 mos, and the wool would have been white.
I have a Jersey wooly who is as black as I've ever seen them. He doesn't have a proper sr coat yet. As it grows out, he will no longer be black, until he hits the end of his coat cycle, whenever he molts, and he may not have a black coat again for a while.
The first picture is him now, after blowing the jr coat. Th second picture is the jr coat. I need to get picts of the Angora, who looks horrible, in the middle of a food induced molt, and because I did not shear him, and he's very hard to pluck, I will have to wait for the new black coat to force the old gray/white coat out.