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Dyeing properties of soybean fabrics on gromwell colorants were studied for the effect of dyeing conditions,such as colorants concentration, temperature, time and pH on the dye uptake and effect of mordants on color change, dyeuptake and various colorfastness. Antimicrobial activity of soybean fabrics dyed and sim-mordanted with gromwell col-orants was examined by shake flask method. Gromwell colorants showed considerably affinity to soybean fabric and itswere involved in the adsorption of gromwell colorants to soybean fabric. Soybean fabrics showed R color on Al, Cu andSn mordant, RP color on Cr and Fe mordant, but soybean fabrics showed low dye uptake depending on mordanting treat-ment. Light colorfastness was increased for Cr and Fe mordants. Staphylococcus aureus reduction rates were above 90%for Cr and Cu mordanted soybean fabrics, and the others were poor. Klebsiella pneumoniae reduction rates soybean fabricsdid not show reduction rate hardly.