Two-stage process for bleaching plant matter.

(57) EXAMPLE The process of the present invention is directed to treating plant material with aqueous alkaline zinc oxide peroxide, in the following way: (1) treated with plant material, aqueous alkaline hydrogen peroxide, containing as many alkali materials as the pH of the syringe, at the end of 9; 2) the stench in step 1) is filtered and washed at least 50% with water; 3) treating the additive in step (2) with an aqueous alkaline hydrogen peroxide solution having as many alkali agents as the pyrethroid pH at the end of the treatment is not more than 8.5; 4) the bleach in step 3 is filtered and washed with water. ŕ