The improvement of colorfastness properties of tie dyed cotton knit fabrics with reactive dye has been studied. Pretreated cotton knit fabric is use to dyeing for easy absorption and retention of dye. Color fastness properties of any dyed fabric are very important aspects as the end use of fabric depends on these properties. This study is to evaluate the color fastness to washing and perspiration using the method ISO 105-2CS:2002 and ISO105-E04. The fabric is dyed with reactive dye in same concentration but in two different temperature (30°C and 60°C) and with different amount of sodium carbonate (15 g/l, 18 g/l and 20 g/l) respectively. It is observed that the increasing temperature and using related amount of sodium carbonate the fabric absorbs more dye. In 30°C temperature the result of washing fastness is fairly good to very good where in 60°C the result is very good to excellent. Perspiration fastness result is fairly good to very good both in 30°C and 60°C temperature. The result shows very good of all washing and perspiration fastness in 20 g/l sodium carbonate. The result is concluded that the color fastness of tie-dyed samples is improved by the increasing of temperature and higher amount of sodium carbonate.
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