Synthetic colorants, c 1900.
© Science Museum / Science & Society Picture Library
Four jars containing synthetic colorants. Homophosphine G synthetic dye manufactured by Farbwerk MUlheim A. Leonhardt & Co, MUlheim-am-Main, Germany; Blue for silk T5 B00 by K. oehler, Offenbach-bei-Main, Germany; Brilliant Acid Carmine B by oehler; Orange P by oehler. Orange P was an azo dye introduced by BASF in 1877. oehler, which had started with picric acid in 1856, was taken over by the Griesheim-Elektron company in 1905 and hence became part of I.G. Farbenindustrie AG in 1925. August Leonhardt and Leo Gans set up a dye factory at Fechenheim (near Offenbach) in 1870. After the partnership broke up, Leonhardt established another dye factory in the neighbouring town of MUlheim-am-Main in 1879. It became a limited company as Aktien-Gesellschaft Farbwerk MUhlheim vorm. A. Leonhardt & Cie. in 1895. Part of a collection of late nineteenth and early twentieth century colorants transferred from the Colour Museum, Bradford, in 1985.