عنوان مقاله [English]
Nowadays, due to the ecological and health concerns associated with the use of synthetic dyes, there is a great tendency for the use of natural dyes in the dyeing of textiles, especially natural fibers. Unlike protein fibers, cotton has a very low affinity toward the natural dyes and the dyed goods have low fastness properties besides low color strength. In this study, several investigations reported on the improvement of natural dyeing of cotton fibers have been reviewed and classified. Different methods including the use of metal mordants, enzymes, bio-mordants, cationic and anionic compounds, amine compounds, ultrasound, gamma rays, plasma technology, UV rays and microwave have been considered and the results of the reported literature have been reviewed.