Influence of UV radiations on the extraction and dyeing of cotton fabric with <i style="">Curcuma longa</i> L

Abstract

The methanolic extract of irradiated <i style="">Curcuma longa</i> L powder has been prepared and used to study the dyeing conditions and characteristics of dyed cotton fabrics. The dyeing parameters such as time, material-to-liquid ratio and salt concentration have been optimized. To improve the colour fastness, pre- and post-mordanting has been carried out using copper , iron and alum mordants. The dyed samples are subjected to CIE Lab system using spectraflash SF-650 for the evaluation of colour strength and L*, a* and b* values. Finally, ISO standard methods are employed to study the colour fastness of dyed and mordanted fabrics. It is observed that the UV-radiation not only enhances the colour strength of dye on cotton fabric but also improves the colour fastness properties of irradiated cotton using methanol solubilized extracts of pre-irradiated <i style="">Curcuma longa</i> powder.