| http://www.w3.org/ns/prov#value | - Thus, the reaction of chlorine dioxide with lignin produces strong acids as byproducts which tends to depress the pH to low levels and thus reduces the effectiveness of chlorine dioxide as a bleaching agent and it is preferred as set forth in this patent to incorporate a buffering agent such as a mild alkali or alkali metal salt of a weak acid into the pulp before contact with the chlorine dioxide
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