Fuente: WIPO "olive table" The invention comprises chromium and cobalt complex compounds containing one molecule of an azo or azomethine compound and one molecule of a formazane compound both bicyclically bound to one chromium or cobalt atom and mixtures of such Cr or Co complex compounds. They may be obtained by treating at least one azo or azomethine compound forming bicyclic heavy metal complexes and at least one formazane compound forming bicyclic heavy metal complexes with an agent giving off Cr or Co. Specified azo compounds are those of the formula