Discharge printing agent comprising (a) a sulfinic acid compound of formula (I) MO-S(=O)-C(R 1 )(R 2 )(R 3 ) (I) or a salt thereof, wherein R 1 is selected from the group consisting of H and NR 4 R 5 ; R 2 is selected from the group consisting of H, OH, alkyl, alkenyl, cycloalkyl and aryl, wherein the alkyl, alkenyl, cycloalkyl, and aryl group are unsubstituted or substituted with 1, 2 or 3 substituents which are independently selected from alkyl having 1-6 carbon atoms, OH, alkoxy having 1-6 carbon atoms, halogen and CF 3 ; and R 3 is COOM, SO 3 M, COR 4 , CONR 4 R 5 or COOR 4 ; each M is independently selected from the group consisting of H, N(R 4 ) 4 + , a monovalent metal ion or divalent metal ion of the groups Ia, IIa, IIb, IVa or VIIIb of the Periodic Table of the Elements; wherein each R 4 and R 5 is independently selected from the group consisting of H or an alkyl group having 1-6 carbon atoms; (b) a thickener comprising a polymer having carboxylic acid groups -COOH or carboxylate groups -COO- attached to the polymeric backbone; (c) an odour control agent, which odour control agent is an organic compound having at least one functional group selected from an isocyanate group (-N=C=O), an isocyanate precursor group, and a carboxylic acid hydrazide group, or a combination of such organic compounds, and (d) water, wherein the discharge printing agent has a viscosity of 2500-150000 mPa·s at a temperature of 20 °C. (a) a sulfinic acid compound of formula (I) MO-S(=O)-C(R 1 )(R 2 )(R 3 ) (I) or a salt thereof, wherein R 1 is selected from the group consisting of H and NR 4 R 5 ; R 2 is selected from the group consisting of H, OH, alkyl, alkenyl, cycloalkyl and aryl, wherein the alkyl, alkenyl, cycloalkyl, and aryl group are unsubstituted or substituted with 1, 2 or 3 substituents which are independently selected from alkyl having 1-6 carbon atoms, OH, alkoxy having 1-6 carbon atoms, halogen and CF 3 ; and R 3 is COOM, SO 3 M, COR 4 , CONR 4 R 5 or COOR 4 ; each M is independently selected from the group consisting of H, N(R 4 ) 4 + , a monovalent metal ion or divalent metal ion of the groups Ia, IIa, IIb, IVa or VIIIb of the Periodic Table of the Elements; wherein each R 4 and R 5 is independently selected from the group consisting of H or an alkyl group having 1-6 carbon atoms; R 1 is selected from the group consisting of H and NR 4 R 5 ; R 2 is selected from the group consisting of H, OH, alkyl, alkenyl, cycloalkyl and aryl, wherein the alkyl, alkenyl, cycloalkyl, and aryl group are unsubstituted or substituted with 1, 2 or 3 substituents which are independently selected from alkyl having 1-6 carbon atoms, OH, alkoxy having 1-6 carbon atoms, halogen and CF 3 ; and R 3 is COOM, SO 3 M, COR 4 , CONR 4 R 5 or COOR 4 ; each M is independently selected from the group consisting of H, N(R 4 ) 4 + , a monovalent metal ion or divalent metal ion of the groups Ia, IIa, IIb, IVa or VIIIb of the Periodic Table of the Elements; wherein each R 4 and R 5 is independently selected from the group consisting of H or an alkyl group having 1-6 carbon atoms; (b) a thickener comprising a polymer having carboxylic acid groups -COOH or carboxylate groups -COO- attached to the polymeric backbone; (c) an odour control agent, which odour control agent is an organic compound having at least one functional group selected from an isocyanate group (-N=C=O), an isocyanate precursor group, and a carboxylic acid hydrazide group, or a combination of such organic compounds, and (d) water, <EOS>