"Tyrian purple (Greek, πορφύρα, porphyra, Latin: purpura), also known as Phoenician purple, Tyrian red, royal purple, imperial purple or imperial dye, is a bromine-containing reddish-purple natural dye. It is a secretion produced by several species of predatory sea snails in the family Muricidae, rock snails originally known by the name Murex. In ancient times, extracting this dye involved tens of thousands of snails and substantial labor, and as a result, the dye was highly valued." -- Wikipedia
