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What is squid or cuttlefish ink made of?

animals Biology cuttlefish fish Jellyfish life Marine Octopus Squid
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What is squid or cuttlefish ink made of?

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The dark coloring is from melanin. However the it also contains chemicals to signal other squid. So it acts to warns them when they smell L-dopa one of the precursors of melanin synthesis emitted also. A smaller amount of dopamine is also present in the ink. Since the squid surface at night they seem to signal threats by smell since other squid scenting ink avoid the area. http://answers.yahoo.

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