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Not AvailableWool/cotton union fabric was dyed with a direct dye in union shade. The dyeing was performed in a single bath in relation to four factors: leveling agent (Lyogen SMKI, 0-1.5 % oww), electrolyte (sodium sulfate, 0-10 %), dyeing temperature (85-95 oC), and dyeing time (15-60 min). The dyeing was characterized by dye bath exhaustion (%), color strength (K/S val-ue), washing fastness, and light fastness of dyed sample. Response surface analysis showed that the exhaustion of direct dye increased with electrolyte, dyeing temperature, and dyeing time while the K/S value followed a linear shape with lev-eling agent and dyeing temperature. An optimized recipe was formulated based on response surface strategy and numeri-cal optimization solution.Not Availabl