The quantity of chemicals to be employed will depend on the wood to be bleached and on the brightness increase desired. As a typical example, in recent plant trials, a brightness increase of 9 points was obtained by use of the following formula in a beater heated with live steam. Percentages of chemicals are based on the weight of the dry pulp Sodium Silicate/5.00% Hydrogen Peroxide/0.91 of H2O2 or 2.6 of 130.0 volume Epsom Salts/0.02%. Caustic Soda/1.00%
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