Sample book containing 495 cotton samples dyed with Friedrich Bayer & Co. brand benzidine-based dyes. Benzidine is a synthesized substance that was commonly used in the preparation of direct dyes, or dyes which do not require a mordant. Benzidine has been banned in the United States due to its highly carcinogenic nature.
Farbenfabriken vorm. Friedrich Bayer & Co. Benzidinfarben Auf Baumwollstückware, 1901. https://digital.sciencehistory.org/works/1zshph4.
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