sepia

noun

• 1a reddish-brown colour associated particularly with monochrome photographs of the 19th and early 20th centuries: [as modifier]:old sepia photographs
• a brown pigment prepared from a black fluid secreted by cuttlefish, used in monochrome drawing and in watercolours.
• [count noun] a drawing done with sepia pigment.

• 2a blackish fluid secreted by a cuttlefish as a defensive screen.