This Ancient Factory Helped Purple Reign

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. The common name of the dyestuff, Tyrian purple, derives from the habitat of the mollusks, which the Phoenicians purportedly began…