Difference thresholds for timbre related to spectral centroid

Composition for combating slimes containing as the active compound combination, tetramethylthiuram disulfide and aroyl-ethyl-ammonium salts having the formula wherein R1 is optionally monosubstituted or polysubstituted aromatic, carbocyclic or heterocyclic, radical and R2, R3 and R4 are the same or different and are optionally monosubstituted or polysubstituted aliphatic or aromatic carbocyclic or form, together with 4 to 6 hydrocarbon members, a heterocyclic ring, and X is an anion of an inorganic or organic acid.