The purpose of diploma work was to dye cotton with curcuma dyestuff at different conditions. Chemically bleached 100 % cotton fabric was dyed with curcumin at different times (10, 20, 30, 40, 50 and 60 minutes) and different temperatures (40, 60 and 80 ºC). The colour of dyed samples was determined by colour measurements (CIE L*a*b* and K/S) using a reflectance spectrophotometer Spectraflash 600 Plus. The exhaustion of the dye from the dyebath was determined by using the calibration curve. The transmittance of ultraviolet radiation of dyed samples was measured using UV/Vis spectrometry. Dyed samples were also analysed for their wash fastness. The dye exhaustion was the highest for dyeing at the lowest temperature (40 ºC). The CIE L*a*b* values indicate that the samples that were dyed at higher temperatures were darker. K/S values were similar for all samples, however the highest K/S value was determined for a sample dyed at 80 ºC. In general, dyed samples had poor wash fastness, although slightly better fastness was determined for the samples dyed at the higher temperature. The results of ultraviolet protection factor (UPF) show that the highest value was determined for the sample dyed at 80 ºC (UZF = 27.93). The values of UPF decreased by half after washing.
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