Deep down inside, I imagine that every cuttlefish wishes he or she was a Kraken.
Sepia ink is made from grinding dried cuttlefish ink sacks to a fine powder and mixing it with shellac. The cuttlefish, Sepia Officinalis, is a relative of both the squid and the octopus and uses its ink for communication & self-defense.
Sepia ink was commonly used in the 18th and 19th centuries but the color is now most commonly made from artificial dyes. Actual cuttlefish ink remains popular in Mediterranean cuisine.