Keywords: Tyrian purple on grayscale.jpg 6 6'-dibromoindigo the main component of Tyrian purple photographed against 18 gray card and color control patches from my antique color dataguide en wikipedia 2007-07-17 Brochis wikipedia en Brochis original upload log page en wikipedia Tyrian_purple_on_grayscale jpg 2007-07-17 04 44 Brochis 1688×1348×8 248864 bytes <nowiki>6 6'-dibromoindigo the main component of Tyrian purple photographed against 18 gray card and color control patches from my antique Kodak color dataguide </nowiki> Tyrian purple Gray cards |