Brightness reversion General approach Lignin-containing mechanical pulps are typically used as short-life products and bleached to a brightness level of about 80 % ISO using two alkaline hydrogen peroxide (H2O2) stages or an alkaline H2O2 stage followed by a sodium dithionite (Na2S2O4) stage.1 Therefore, many modern mechanical pulp mills can produce high-yield mechanical pulps at brightness
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