4.9 Parts of a monoazo dye in the form of a chromium complex containing one atom of chromium per molecule of the monoazo dye which had been prepared from diazotized 2-amino-5-sulfobenzoic acid and 1-(3'-chlorophenyl)-3-methyl-5-pyrazolone and 3.7 parts of a metal-free monoazo dye which had been prepared from diazotized 2-aminobenzoic acid and link were stirred in 360 cc of water at 20°-40° C. The resulting suspension was made neutral by adding thereto under agitation diluted hydrochloric acid or glacial acetic acid or, if necessary, sodium carbonate and then heated to 85°-95° C. In the course of this treatment, a yellow clear solution was formed. The reaction was continued in neutral state until the two kinds of dyes used as starting materials disappear. To the reaction solution was then added sodium chloride and the resulting mixed complex was isolated by filtration and dried. This dye was a yellowish brown powdery substance represented by the formula (4) and dyed wool in yellow tint having good fastness from a bath containing ammonium acetate.