Abstract: A bleach catalyst system comprising in combination, a macrocyclic organic ligand of formula (I): wherein R1 and R2 can each independently be absent, H, alkyl or aryl, optionally substituted; t and t′ are each independent integers from 2-3; each D can independently be N, NR3, PR3, O or S, wherein each R3 is independently H, alkyl or aryl, optionally substituted by one or more suitable substituents such as C1-4 alkyl groups, or is a bridging group such as C1-6 alkylene, either to another R3 group in the same macrocycle or to another independently defined macrocycle or to another independently defined macrocyclic ligand of formula (I), wherein any bridging group optionally contains an optionally substituted heteroatom such as nitrogen; and s is an integer from 2-5; and a water-insoluble manganese compound.

Abstract: A bleach catalyst system comprising in combination, a macrocyclic organic ligand of formula (I): 1