Composition and method for bleaching a substrate

A composition for bleaching a catechol-type or polyphenolics-type or polycyclic hydroxylated aromatic-type stain on a substrate, comprising a copper transition metal catalyst, or precursors thereof, of a macrocyclic ligand of formula (I)

• 2
• X is independently selected from:
• N, S, O, and P;
• q is independently selected from:
• 0 and 1;
• R is independently selected from:
• hydrogen, alkyl, alkenyl, alkylene;
• R1 and R2 are independently selected from:
• H, C1-C4-alkyl, and C1-C4-alkylhydroxy;
• n and m are independently selected from:
• 0, 1, 2 and 3, and wherein if n=0 then q=0;
• with the proviso that n +m +q takes a value selected from 2 and 3.
• p is independently selected from:
• 3, 4, 5 and 6, wherein the ring size of the macrocyclic ligand=p(1+n+q+m) and is at least 9 and less than or equal to 15, wherein in an aqueous solution at least 10%, preferably at least 50% and optimally at least 90% of any bleaching of a substrate is effected by oxygen sourced from the air.