Abstract
The dyeability and antibacterial activity of fabrics dyed with lavender extract were analyzed. The results obtained are as follows. The surface color of all the dyed fabrics was tinged with green or yellow of a slight red tint. In the test results of dyeing colorfastness, the colorfastness to sunlight of the dyed fabrics which is both not treated with a mordant and treated with a K2Cr2O7 mordant was excellent with 4th grade of colorfastness. The others showed below 2nd grade. The colorfastness to laundry showed, as most of dyed fabrics were 4th-5th grade, relatively excellent results. The colorfastness to perspiration showed different results respectively according to the kind of both dyed fabrics and mordants. The colorfastness to crocking of the dyed both cotton and silk fabrics showed the excellent result of 4th-5th grade. The colorfastness to dry cleaning of all the dyed fabrics was excellent with 4th-5th grade. In the test results of antibiosis, the dyed fabrics of both cotton and silk didn't show the significant decrease rate for the fungus called Klebsiella pneumoniae. For the fungus called Staphylococcus aureus, the dyed cotton fabric showed the decrease rate of $98\%$ and the dyed silk fabric showed the decrease rate of $50\%$. For the fungus called Chaetomium globosum, the dyed fabric of cotton didn't show the significant antibacterial efficacy, but the dyed fabric of silk showed the significant antibacterial efficacy for the mold fungus called Aspergillus niger.
