SEPIA n. 4 definitions
A pigment prepared from the ink, or black secretion, of the sepia, or cuttlefish. Treated with caustic potash, it has a rich brown color; and this mixed with a red forms Roman sepia. Cf. India ink, under India. Sepia drawing or picture, a drawing in monochrome, made in sepia alone, or in sepia with other brown pigments…