Sepia is a reddish-brown color, sometimes specifically made for artists from cuttlefish ink. The distinctly brown-tinted photographs of the 19th century are also described as sepia.
In both Greek and Latin, sepia means "cuttlefish." The ancient Greeks and Romans were the first to take advantage of the fluid these fish release when they're startled — it was prized as a pigment for both writers and artists. The word itself came to be used for both the pigment and its red-brown color. Antique sepia-colored photographs are so well known and popular that many modern photographs are deliberately edited to appear sepia-toned.