| http://www.w3.org/ns/prov#value | - Particular preference is given to copper complexes containing water-solubilizing groups of azo dyes of the formula ##STR1## in which D is a radical of the benzene or naphthalene series, Y is an HO, CH3 O or HOOC group and Y' is an HO or an amino group, and in which K is the radical of a coupling component of the benzene, naphthalene or heterocyclic series or the radical of a ketomethylene compound
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