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The most prized pigment of antiquity was processed not from a tangle of root or the frothy extract of a weed, but by drawing out a slimy secretion from the mucus glands behind the anus of murex sea snails — “the bottom of the bottom-feeders,” the historian Kelly Grovier has written.

Mouhamad Ghassen Nouira works from a hut in his garden to process murex snails using techniques first developed by the Phoenicians to produce a dye known as Tyrian purple that sells online for about $2,500 a gram.

"This hobby started when I was a boy in history class studying the Canaanites, the Phoenicians and the Carthaginians and how they were famous for extracting purple from murex and it was more expensive than gold," Nouira said.

Years later, he noticed a dead murex on the beach and recalling his history classes decided to experiment with ways of making the dye.

Nouira spent 14 years working out how to produce the dye from nets of murex he buys from a local fisherman, extracting the glands, crushing the shells, fermenting and cooking them and eventually producing tiny amounts of purple powder.