The Name and Imperial Purple

Bromine's name records nothing more than its evil smell, but the element carries an unexpected thread of ancient prestige. The famous Tyrian purple of the Phoenicians and of Roman imperial robes, the dye extracted at great labour from the murex sea-snail and reserved for the highest ranks, is chemically a dibromoindigo, its regal colour owed to the very bromine atoms that Balard would isolate from the sea more than a millennium later. The element itself has no alchemical or mythological history, being a nineteenth-century discovery, but through the murex dye its atoms sat, unrecognised, at the heart of one of the ancient world's most potent symbols of rank and power.

Producing a single gram of genuine Tyrian purple dye required processing many thousands of murex sea-snails, a labour cost that made the finished cloth worth more than its weight in gold in the ancient Mediterranean; Roman sumptuary laws eventually restricted the deepest purples to the emperor alone, so that purpura became a literal marker of imperial rank rather than mere fashion. The dye works of Tyre and Sidon were famous, and reportedly foul-smelling, industrial sites of the Phoenician coast for over a thousand years before synthetic dyes, unrelated to bromine, made purple cheaply available to everyone in the nineteenth century.