In this work, we discuss a useful and proper way to get new triarylmethane dyes carrying two bromine functionalities offering the possibility for polycondensation via the Suzuki cross-coupling reaction. The molecular weights of the new copolymers PI-OH-P4-OH are determined for the leuco forms by GPC ( polystyrene standard). Conversion of the leuco form to the colored form is done in dichloromethane with trifluoroacetic acid.