The greener technologies, such as radiation treatment, are gaining worldwide fame due to their promising role in reducing effluent pollution. For the current study, two sources of catechin-based natural colorant in binary form have been appraised for cotton using a statistical approach. Dyeing variables were selected through central composite design under response surface methodology and at dyeing conditions, pre, post, and meta mordanting using eco-friendly anchors. It has been found that 25 mL of the binary extract of pH 9, having 2 g/100 mL of salt at 80?C for 55 minutes after microwave (MW) treatment up to 4 min, has given an excellent yield (K/S = 2.48). Using 1.5% of tannic acid (TA) before dyeing of cotton has given excellent colour strength up to 4.11 K/S, whereas using myrobalan extraction (2%) after dyeing of cotton with binary extract has given better yield (K/S = 2.85) with good colorfastness. It is concluded that a statistical approach in combination with the MW treatment should be used to explore the coloring behavior of plant dyes for cotton under selected conditions, and the addition of eco-friendly additives (mordants) should be used to get colorfast shades.
Bilal et al. (Thu,) studied this question.