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Based on the German article and the general idea that anilines are usually colorless, it appears that the diamine is probably not Wurster's blue, but a derivative of it. If so, we could change Wurster's blue to a redirect that points to Tetramethylphenylendiamine (trivial name). Just a thought. --Smokefoot (talk) 14:49, 10 November 2010 (UTC)[reply]