Patent ID: 7872130

Claim:
A mixture of oligomeric phenazinium compounds, containing at least two phenazinium compounds selected from the group consisting of: a) compounds containing two monomeric units having the following chemical formula <I>: and b) compounds containing three monomeric units having the following chemical formula <II>: as well as further oligomeric phenazinium compounds, wherein, in the aforementioned chemical formula <I> and <II>, the structure unit N(R 5/5′/5″ )CC(R 4/4′/4″ )C(R 3/3′/3″ ) has one of the chemical formula <IIIa> or <IIIb>: wherein further R 1 , R 2 , R 3 , R 4 , R 6 , R 7 , R 8 , R 9 , R 1′ , R 2′ , R 3′ , R 4′ , R 6′ , R 7′ , R 8′ , R 9′ , R 1″ , R 2″ , R 3″ , R 4″ , R 6″ , R 7″ , R 8″ and R 9″ have each independently one of the meanings selected from the group consisting of hydrogen, halogen, NH 2 , amino substituted with lower alkyl, OH, CN, SCN, SH, C 1-8 alkyl and phenyl as well as a single bond that links the individual monomeric units together, R 5 , R 5′ and R 5″ denote each independently H, C 1-8 alkyl or phenyl, and at least one of the residues selected from the group consisting of R 2 , R 2′ , R 2″ , R 3 , R 3′ R 3″ , R 7 , R 7′ , R 7″ , R 8 , R 8′ and R 8″ has one of the meanings selected from the group consisting of halogen and hydroxy, wherein further A − is an acid anion and wherein further all of the oligomeric phenazinium compounds having the chemical formula <I> and <II> are contained in the mixture in an amount of at least 80 mol-%.