Tyrian purple

Tyrian purple, also known as royal purple, imperial purple, imperial dye, or simply tyrian, is a reddish-purple natural dye. It is secreted by several species of predatory sea snails in the family Muricidae, rock snails originally known by the name murex. The coloured compound is 6,6'-dibromoindigo.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 4.0

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