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: The natural dyeing of silk fabrics with guava leaf extract was investigated. Mixed components of flavonoid andtannin seem to be the components of guava leaf extract. The temperature and time for dyeing of silk fabrics with guavaleaf extract were 40 o C and 90 o C for eighty minutes, respectively. The dyeing equilibrium was shown at the fourth timeof repeated dyeing. The highest K/S value was recorded at pH 3. Fe-mordanted fabrics showed the highest K/S value.High K/S values were shown in the post-mordanting of dyed fabrics at 40 o C and the pre-mordanting of dyed fabrics at90 o C. After repeated dyeing and mordanting, various color change occurred with mordant treatment. Surface colors werechanged to YR color in alkaline water extract and to Y color in acidic water and ethanol extract, respectively. The washingfastness was level 3-4 for Sn-mordanted fabrics and level 4 for Fe-mordanted fabrics, and the dry cleaning fastness alsoshowed very excellent result with level 4-5. The rubbing fastness was satisfactory with level 3-4. The light fastness wasabove level 4 only when Fe-mordanting was conducted, and the rest of dyed fabrics was not fast enough. In the anti-bacterial activity, the powder of guva leaf extract showed 99.9% of high antibacterial activity and Staphylococcus aureusshowed 99.6% in dyed fabric. All dyed fabrics showed higher deodorization and UV protection rate than control fabric. Key words:guava leaf extract, dyeability, K/S value, color fastness, functionality

han'gug uilyu san'eob haghoeji/han-guk uiryu saneop hakoeji

Natural Dyeing of Fabrics with Guava (Psidium guajava L.) Leaf Extract - Characteristics of Guava (Psidium guajava L.) Leaf Extract and Dyeability with Silk Fabrics -