IMPROVED PAPER DYEING PROCESS
This specification discloses an improved paper dyeing process in which paper pulp stock is prepared and subjected to a hot dispersion process, adding a sulphur dye after the hot dispersion process, and acidifying the dyed pulp stock to fix the dye. The dye can be added at any suitable time immediately following hot dispersion, and may be added just prior to or during the treatment of the pulp by disperser plates or the like.