| http://www.w3.org/ns/prov#value | - In general this invention comprises adding to a cellulose substrate, in particular paper, a colorant such as a dye or pigment, which colorant is insoluble in water, but soluble in organic solvents, and during or after the drying of the paper to which the colorant has been added, treating the paper with an organic solvent in which the colorant is soluble.
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