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Hydrogen peroxide is a unique bleaching chemical with many applications in the bleach plant. Other bleaching chemicals have specific uses and requirements, but peroxide can be used for delignification or brightening, and it doesn't require any special equipment. In fact, peroxide can be added directly to a pulp storage chest to increase the brightness two to three points. Peroxide is often used to reinforce extraction stages in elemental chlorine-free bleaching sequences. This addition increases brightness and reduces chlorine dioxide consumption. Chlorine dioxide use can be reduced further by replacing a final chlorine dioxide stage with a peroxide stage. Peroxide use is essential in reaching the target brightness in total chlorine-free bleaching sequences. This module focuses on peroxide bleaching of chemical pulp. But peroxide is also used extensively for mechanical pulp bleaching.