• Miss Meghasree Baishya
• Dr. Himangshu Barman
• 3Sheikh AbdusSafurRahman

With objectives to support Eri silkworm cocoon producers to get additional income from produced cocoon shells and to overcome some of the problems related to Eri yarn in colouring process, this research work had been undertaken to study value addition aspects of raw Eri cocoon shell. Extracts of biomaterials like carrot, turmeric, Silikha, red beet, teak leave, onion and red beet stem were used to colour degummed Eri cocoon shells. These biomaterials gave colour shades differently and also resulted biomaterial specific weight regain parameters. Silikha and turmeric produces highest percentage of colour shade and maximum weight regain, whereas carrot resulted lowest colour shade and weight regain. As spanning of coloured cocoon shells produce coloured Eri yarn, damage like swelling and loose of twisting cannot happen to yarn. Being eco-friendly, people acceptance is more and, easily available, colouring with biomaterials is practically viable.

Biomaterial, mordant, degumming, yarn. Cocoon shell, texture, silk fibre, fabric, fastness.

"Value addition to raw cocoon shell of Eri silkworm through colouring with bio-materials", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 6, page no.360-364, June 2019, Available :http://www.jetir.org/papers/JETIR1907M46.pdf

"Value addition to raw cocoon shell of Eri silkworm through colouring with bio-materials", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 6, page no. pp360-364, June 2019, Available at : http://www.jetir.org/papers/JETIR1907M46.pdf