Tyrian purple

Short definition from Wiktionary

Noun

1. 1
   A deep purple dyestuff obtained from the bodies of mollusks of certain species of the family Muricidae, originally certain of those of the eastern Mediterranean, now also other species from elsewhere.
2. 2
   A deep purple colour, tinted with red, like that of the dye.

Adjective

1. 1
   Of a deep purple colour, tinted with red, like that of the dye.