| http://www.w3.org/ns/prov#value | - where D- is an anionic dye and R5 and R6 are independently selected from the group consisting of aromatic nucleii such as phenyl or naphthyl and n is 1 or 2; and anionic dye-pyryllium compounds of the formula (V): ##STR19## where D- and n are as defined above are typical examples of anionic dye complexes.
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