Patent ID: 8889611

Claim:
A composition in solid form comprising a) at least one manganese complex compounds of the formula (1) wherein M independently of the others is selected from the group consisting of manganese in oxidation state III and IV, X independently of the others is a coordinating or bridging species selected from the group consisting of H 2 O, O 2 2− , O 2 2− , O 2− , OH − , HO 2 − , SH − , S 2− , SO, CI − , N 3− , SCN − , N 3 − , RCOO − , NH 2 − , and NR 3 , where R is a radical selected from the group consisting of H, alkyl and aryl, L independently of the others is an organic ligand which each contain at least two nitrogen atoms coordinated to manganese, z is an integer from −4 to +4, Y is a monovalent or multivalent counterion selected from the group consisting of chloride, sulfate, hydrogen sulfate, nitrate and acetate, which leads to the charge neutrality of the complex, and q is an integer from 1 to 4, and b) at least one salt of the formula R′—C 6 H 4 —SO 3 Me, in which R′ is CH 3 or C 2 H 5 and Me is Na, K, Ca or Mg, wherein the molar ratio of manganese complex compound of the formula (1) to a salt of the formula R′—C 6 H 4 —SO 3 Me is from 1:0.5 to 1:5.