Hercules gets the initial credit for discovering purpura. He was strolling along the seashore with a svelte nymph, Tyros, and his dog was trotting along ahead in the sand. When they caught up with the dog, its muzzle was smeared with a brilliant, deep red-purple colour—a colour neither of them had ever seen before. Tyros begged Hercules to make her a garment with that hue (in fact, she told him she wouldn’t be with him unless he produced it), so he began collecting shells from the beach.

Shells? Yes, the famous Tyrian purple dye was made from snail shells: from the murex mollusk (shown above), a type of sea snail. It would take 250,000 murex shellfish to obtain one ounce of Tyrian purple, so the dye was highly valued. Purpura (its latin name) became the colour of royalty. It was produced in the city of Tyre, by the Phoenicians (whose name came from the Greek word phoinos, meaning “blood red”). They had been producing dyes in Tyre, and beyond, since 1000 BC.

“The Tyrian colour is most appreciated when it is the colour of clotted blood,” Pliny wrote, “dark by reflected and brilliant by transmitted light.”

By 400 AD, the murex mollusk was on the brink of extinction—a colour vanished from the world, perhaps.

Can a colour really go extinct? (more…)