I am your sister now, Blueowl. My first grey hair in one of the brows has appeared (I am 52, soon to be 53). And it is shorter than my regular black hairs, stiffer, coarser and sticks out whereas the black hairs are flat agains the surface of the face. I tried covering it with the brow mascara but that did not quite do the job. I do not know what to do about it and what would happen if I get a lot of them. I did not expect this problem but it has been handed to me so to speak. I am afraid I would need to learn to pluck. I have never used tweezers. I do not even own a pair.