1924 Baeyer and Sunder companies produced Indigosol 0.1921 Bader developed soluble vat colors.1905 Freidlander discovered Thio-indigo Red.1901 Rene Bohn invented and patented Indanthrene Blue RS.1885 von Gallois and Ullrich discovered Para Red dye.1885 Duisberg produced Benzopurpurine direct dye.1880 Thomas and Holliday synthesized azo dye.1878 von Baeyer synthesized synthetic indigo.1878 Biebrich Scarlet invented red acid dye.1877 Dobner & Fisher discovered Malachite Green discovered. ![]()
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