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The effect of alkalinity, transition metals, and oxygen on alkaline darkening of mechanical pulp, and its relations to subsequent peroxide bleaching were further investigated. The chromophores generated under mild conditions of an alkaline treatment can be destroyed in a subsequent peroxide stage. Peroxide‐resistant chromophores are generated only under severe conditions. The results also show that a short alkaline pretreatment can improve the performance of a peroxide bleaching stage.
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He et al. (2004) studied this question.
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