The conventional two-stage H2O2method was applied for bleaching rice straw and bagasse pulps. The pulps were bleached also by a nonconventional method: i.e., using different organic solvents with various contents in the first stage of the bleaching process. The effects of the kind and percentage of the organic solvent in the bleaching mixture on the properties of both the bleached pulps and paper sheets were studied and are discussed on the basis of the physicochemical properties of the bleaching mixtures.