When he shone white light into an empty shell, the structure scattered only blue-green wavelengths (the same ones given off by snail’s shining cells); all the other colours passed straight through.

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Blue sea dragon, sea swallow, blue ocean slug ... But it turns out that it isn’t actually live mantle tissue that covers the shell. The flamingo tongue snail only retracts these mantle flaps ...

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A new analysis shows that three scraps of fabric found in Israeli caves had been dyed indigo, purple and crimson — the hues of Roman royalty — using sea snail ink some 2,000 years ago.