A series of deeply Coloured 5-methylmercapto and 5-dimethylamino substituted tris(2-thienyl)methinium perchlorates has been prepared by the reaction of 2-methylmercapto-5-lithiothiophene with methyl 2-dimetylamino-5-thiophenecarboxylate, bis(2-dimethylamino)ketone, or diethyl carbonate, respectively. The products have been characterized spectroscopically.