Note All in a robe of darkest grain — MILTON’S MINOR POEMS.
Reading edition
33. All in a robe of darkest grain. In Par. Lost V 285, the third pair of Raphael’s wings have the color of sky-tinctured grain; and XI 242, his vest is of purple livelier than “the grain of Sarra,” or Tyrian purple. This would leave us to infer that the robe of Melancholy is of a deep rich color, so dark as to be almost black. Dr. Murray quotes from Southey’s Thalaba, “The ebony ... with darkness feeds its boughs of raven grain.” What objection is there to making the grain in Milton’s passage black?