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Cotton fabric was treated with chitosan to improve the dyeability to black tea colorants. In order to investigate the efficacy of chitosan for improving dyeing properties of cotton fabric, the effect of chitosan treatment conditions and dyeing conditions on dye uptake of the cotton fabrics treated with chitosan were examined and the colorfastness to washing, perspiration, rubbing and light was also evaluated for practical uses.
Dye uptake was increased with the increase of chitosan concentration. Regardless of chitosan treatment concentration, it was increased slowly with the increase of concentration of black tea colorants. Curing increased dye uptake slightly. Dyeing temperature did not affect significantly dye uptake and the maximum dye uptake was obtained at pH 4. Most colorfastness was relatively good, showing 4/5 ~ 5 rating. But chitosan treatment adversely affected colorfastness to light of the cotton fabric. Chitosan concentration and curing did not affect colorfastness.

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