Dyeing performance of natural rice leaf pigment on silk fabric is studied based on rare earth mordant dyeing,the mechanism of rare earth lanthanum chloride mordant is depicted as well.Design of Experiment(DOE)and single factor experiment method are adopted to optimize the dyeing parameters.Results show that optimal mordant dyeing process is lanthanum chloride 6 g/L,dye concentration 2 g/L,dyeing at 80 ℃ for 60 min with pH value of 2.Black rice leaf dyed silk fabric with lanthanum chloride as mordant has a color fastness to friction of over 4.5 levels,a color fastness to sunlight of 6～7 levels,and a color fastness to soaping of 4 levels.
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