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There is a page named "File:Tyrian purple on grayscale.jpg" on Wikipedia
1688×1348×8 (248864 bytes) 6,6'-dibromoindigo (the main component of Tyrian purple) photographed against 18% gray card and color control patches from my...(1,688 × 1,348 (237 KB)) - 14:51, 28 June 2023
