<P> The ink is released from the ink sacs ( located between the gills ) and is dispersed more widely when its release is accompanied by a jet of water from the siphon . Its dark colour is caused by its main constituent , melanin . Each species of cephalopod produces slightly differently coloured inks ; generally , octopuses produce black ink , squid ink is blue - black , and cuttlefish ink is a shade of brown . </P>
<P> The ink is released from the ink sacs ( located between the gills ) and is dispersed more widely when its release is accompanied by a jet of water from the siphon . Its dark colour is caused by its main constituent , melanin . Each species of cephalopod produces slightly differently coloured inks ; generally , octopuses produce black ink , squid ink is blue - black , and cuttlefish ink is a shade of brown . </P>
where does the ink from a squid come out of
where does the ink from a squid come out of
ink sacs ( located between the gills )
ink sacs ( located between the gills )