Silk and cotton fabrics were dyed with extract of green tea and black tea, and iron sulfate and copper acetate were used as mordants later. The following conclusion shows the result of study of fixation ratio, surface color, and the rate of durability under condition of each treatment. 1. The extract of green tea and black tea showed at max 280mm regardless of temperature and time of extract and didn't show a tangible absorption peak in the visible section. 2. In the case of silk fabrics, as the temperature rose, the fixation ratio gradually went up, and in the case of cotton fabrics, the fixation ratio gradually gently came down to 70˚C and again rose at 80˚C. 3. Both of the fabrics were fixative a lot in the early 20 minutes. As the hours of dyeing passed, the fixation ratio of silk fabrics increased a lot while the ratio of cotton fabrics increased a little. 4. Under the condition without mordant, the dying materials, green tea and black tea, were dyed into the colors of YR series and was P series by iron mordant, black tea was YR series by copper mordant and black tea was Y series. 5. The rate of sunlight durability of cotton and silk fabrics, without being fixative, were examined for 40 hours and the rate of sunlight durability decreased in general. As the concentration of dying materials was high, the rate of durability was low. The the rate of durability of samples dyed by the extract of green tea rather than that of black tea decreased. 6. The rate of washing durability and the rate of dry cleaning durability were relatively good.
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