Para red

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What Wikipedia says

Para red (paranitraniline red, Pigment Red 1, C.I. 12070) is a dye. Chemically, it is similar to Sudan I. It was discovered in 1880 by von Gallois and Ullrich. It dyes cellulose fabrics a brilliant red color, but is not very fast. The dye can be washed away easily from cellulose fabrics if not dyed correctly.

Excerpt from the Wikipedia article “Para red”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Jü, CC0, via Wikimedia Commons.