Dithionite General approach The objective of lignin-preserving bleaching processes of chemimechanical and mechanical pulps is to selectively eliminate colour-contributing groups (i.e., chromophores) (see Lignin-preserving or lignin-retaining bleaching), while maintaining pulp yield. Additionally, bleaching chemicals should themselves be colourless and run at reasonable cost.1-3 Two main bleaching chemicals, alkaline hydrogen peroxide (H2O2/NaOH, stage designation P) (see
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