A method for brightening virgin mechanical pulp. The method comprises
combining: (i) an aqueous solution comprising sodium borohydride and
sodium hydroxide; and (ii) an aqueous solution comprising sodium
bisulfite, in a chemical mixer and adding output of the chemical mixer to
an aqueous slurry of virgin mechanical pulp. The ratio of (moles
bisulfite-moles hydroxide)/moles borohydride is from 0 to 7.8.