Fading rate of C.I. Direct Red 81 and C.I. Direct Blue 76 on cellophane film has been investigated for the dye systems of single and admixed of both dyes. In the case of single dye system, it has been found that the fading reaction order of the dyes showed 2nd for Red 81 and zero for Blue 76 in a wide range of adsorbed dye concentration. However, it has been observed that the fading rate constant varied with initial dye concentration in both dyes. And it was possible to explain this phenomenon in a well formed formula by introducing water concentration and dye particle number showed in terms of initial dye concentration in the cellophane film. In the case of admixture system, the fading rate of component dyes was not affected by the presence of companion dye, (Received April 20, 1971)