Here’s your interesting photo fact of the day: did you know that sepia toning (when B&W photos are given that distinctive warm tone) is named after the Common Cuttlefish? The scientific name of the species is Sepia officinalis, and the ink produced by the cuttlefish was used for sepia toning when the technique first emerged in the 1880s.
Sepia is a dark brown-grey color, named after the rich brown pigment derived from the ink sac of the common cuttlefish Sepia. The word sepia is the Latinized form of the Greek σηπία, sēpía, cuttlefish. [#]
Nowadays, sepia ink is generally replaced with other dyes or pigments that produce the same hue.