July 2022
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Natural dyes are eco-friendly and sustainable source of colourants than its synthetic counterparts. The present investigation deals with extraction of anthraquinone based dyes from roots of Rubia cordifolia and its utilization in dyeing cotton fabrics using diverse mordants and mordanting methods viz., pre, post or simultaneous mordanting. Dye bath was prepared by boiling the powdered root in water at 100°C. Dyeing efficiency was tested using mordants like myrobalan, aluminium potassium sulphate, copper sulphate, ferrous sulphate or acetic acid. A wide range of colours/shades was produced. pH of dye bath before and after dyeing varied significantly among different mordants used. Percentage dye uptake due to various mordant was significantly (P < 0.001) varied on mordanting methods. Highest dye uptake (72.09 %) was recorded in myrobalan based post mordanting method. Wash fastness and rubbing fastness were in the range of 1/2nd-4/5th acceptable grades. Thus suggest the use of madder roots along with mordants to get flamboyant shades on cotton fabric.