Synthetic colorants, c 1900.
© Science Museum / Science & Society Picture Library
Six jars of synthetic colorants. Eosine 2Y manufactured by Chemische Fabriken vormals Weiler ter Meer, Uerdingen-am-Rhein, Germany; Rosinduline 2G by Kalle of Biebrich (merged with Wiesbaden in 1926); Brilliant Violet 49 by by G. Siegle & Co. of Stuttgart; Helvetia Green YYO by Society of Chemical Industry of Basle (Ciba); Victoria Brilliant Blue B by Farbwerke vormals Meister, Lucius & BrUning of HOchst-am-Main, Germany; Gold Orange by Friedrich Bayer of Elberfeld (and hence presumably before 1881). Eosin(e) is tetrabromofluorescein and was introduced by BASF in 1874; it is one of the most famous dyes associated with Heinrich Caro. Victoria Blue B was another dye made by Caro, for BASF, in 1883. Gold Orange (also called Orange II) was one of the earliest azo dyes. It was made by the German chemist Otto Witt for Williams, Thomas and Dower in 1876. Weiler ter Meer was founded by J. W. Weiler in 1861 and taken over by Edmund ter Meer in 1896. It became part of I.G. Farbenindustrie AG