Lithol Rubine BK

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What Wikipedia says

Lithol Rubine BK is a reddish synthetic azo dye. It has the appearance of a red powder and is magenta when printed. It is slightly soluble in hot water, insoluble in cold water, and insoluble in ethanol. When dissolved in dimethylformamide, its absorption maximum lies at about 442 nm.

Excerpt from the Wikipedia article “Lithol Rubine BK”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Ed (Edgar181), Public domain, via Wikimedia Commons.