Purple - Vine's Expository Dictionary of New Testament Words
Purple[ A-1,Noun,G4209, porphura ]
originally denoted the purple-fish," then, "purple dye" (extracted from certain shell fish): hence, "a purple garment," Mark 15:17, Mark 15:20; Luke 16:19; Revelation 18:12.
[ B-1,Adjective,G4210, porphureos ]
"purple, a reddish purple," is used of the robe put in mockery on Christ, John 19:2, John 19:5; in Revelation 17:4 (in the best texts; some have No. 1); Revelation 18:16, as a noun (with himation, "a garment," understood).