Dyeing of Jute Fabric with Natural Dye extracted from Annato

Grey jute fabric has been scoured and bleached to produce white absorbent jute fabric to dye with natural dye extracted from annato. Extraction of natural dye and application to jute fabric is found to be maximum at alkaline medium. Mordants like myrobolan, pomegranate and ferrous sulphate have their inherent colour whereas potash alum is colourless. So, bleached fabric becomes dark after application of coloured mordants. In case of alkaline method of dyeing using natural dye extracted from annatto, mordanting improves the colour yield compared to control fabric. Double mordanting using myrobolan and ferrous sulphate produces maximum colour yield. In all the cases postmordanting with chemical mordants results in higher colour yield and fastness properties. Two step dyeing following both direct and acid dyeing method produces the best colour yield and fastness properties in case of dyeing with natural dyes extracted from annato. In two step dyeing process, annato produces best dyeing result following premordanting with chemical mordant both in case of double mordanting or single mordanting. In case of two- step dyeing, double mordanting with myrobolan and ferrous sulphate also produces maximum colour yield. In all the cases, mordanting with potash alum produces the best wash fastness properties.