The light of his face rises to his head and the black of his hair. (Mahdism and the Imamate, p. 153)
He has black hair. His beard is black.
(Fera Idu Fevaidi'l Fiqr)
The radiance of his face shines like day in his hair, beard and the blackness of his head, and gives him greatness.
(al-Uqayli, al-Najmu al-Saqib)