Cephalopod ink is a dark pigment released into water by most species of cephalopod, usually as an escape mechanism. All cephalopods, with the exception of the Nautilidae and the species of octopus belonging to the suborder Cirrina, are able to release ink. The ink is released from the ink sacs (located between the gills) and is dispersed more widely by accompanying its release with a jet of water from the funnel. Its dark color is caused by its main constituent, melanin. Each species of cephalopod produces slightly differently coloured inks; generally, octopuses produce black ink, squid i...

Persian (, ) is an Iranian language within the Indo-Iranian branch of the Indo-European languages. It is primarily spoken in Iran, Afghanistan, Tajikistan and countries which historically came under Persian influence. The Persian language is classified as a continuation of Middle Persian, the official religious and literary language of Sassanid Persia, itself a continuation of Old Persian, the language of the Persian Empire in the Achaemenid era. Persian is a pluricentric language and its grammar is similar to that of many contemporary European languages. Persian has ca. 110 million nat...