| http://www.w3.org/ns/prov#value | - The Structure I compounds can be mixed with any water soluble direct blue dye to provide black hues for cellulosics, however, where liquid black paper dyes are desired, the preferred blue dyes are those having the structure: ##STR3## wherein A3 and A4 are the same or different substituents selected from the following: ##STR4## wherein R4 is --OH or --NH2 ; n is 1 or 2 and M is a water solubilizing
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