Squid,
like most cephalopods, are able to produce ink. Ink is mostly made from
a dark pigment called melanin, which is suspended in thick mucus along
with small amounts of other things such as amino acids. Squid ink is
blue-black in colour, while cuttlefish ink is brown and octopus ink is
black.
To make ink, squid have special organs called ink glands and ink
sacs. Ink is continually made by the cells of the ink gland – when
a cell is full, it breaks down and empties the ink into the ink sac for
storage. The ink sac connects to the end of the intestine, which
opens into a siphon (this is the funnel that the squid uses for
jet propulsion).
When a squid wants to "ink", it squeezes the sac so that the ink
squirts into the siphon. There, it mixes with water and is forced out as
the squid shoots off in the opposite direction
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