Plural of crocein; red or orange synthetic dyes of the azo dye class used historically in fabric and leather dyeing.
From Latin croceus (saffron-yellow-colored) + chemical suffix -in/-ein. These dyes were developed in the mid-19th century as part of the synthetic dye industry revolution, particularly in Germany.
Crocein dyes were among the first synthetic dyes created by humans, and they literally changed global commerce—suddenly, brilliant reds and oranges were cheap and available, transforming the textile industry and colonialism's economics.
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