When the nymph saw the purple-stained muzzle of Heracles’ companion, she requested a garment of the same rich complexion. Unlike other textile colours, whose lustre faded rapidly, Tyrian purple (so-called after the Phoenician city that honed its harvesting) only intensified with weathering and wear – a miraculous quality that commanded an exorbitant price, exceeding the pigment’s weight in precious metals.

It took tens of thousands of desiccated hypobranchial glands, wrenched from the calcified coils of spiny murex sea snails before being dried and boiled, to colour even a single small swatch of fabric, whose fibres, long after staining, retained the stench of the invertebrate’s marine excretions. The colour that means both life and death The racist message hidden in a masterpiece The toxic colour that comes from volcanoes Though purple may have symbolised a higher order, it reeked of a lower ordure. That insalubrious process, undertaken since at least the 16th Century BC (and perhaps first in Phoenicia, a name that means, literally, ‘purple land’), was notoriously malodorous and required an impervious sniffer and a strong stomach. Associated since antiquity with regality, luxuriance, and the loftiness of intellectual and spiritual ideals, purple was, for many millennia, chiefly distilled from a dehydrated mucous gland of molluscs that lies just behind the rectum: the bottom of the bottom-feeders. Purple is a paradox, a contradiction of a colour.

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