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Asim Kumar Roy CHOUDHURY; Eco-friendly dyes and dyeing; Advanced Materials and Technologies Environmental Sciences; 2018:2(1):157-188
Dyeing and finishing processes for the textiles are practiced by human beings since ancient time. However, in recent years a lot of attention has put in these processes because of the awareness of sustainability and eco-friendly textiles and garments. Textile processes use many toxic dyes and chemicals. This waste water is discharged into fields, ponds or rivers without or improper effluent treatment. As a result, the workers and people coming in contact with discharge water suffer from various skin diseases and respiratory problems. The people are becoming more and more health conscious and demands for producing textile products through environment friendly and sustainable dyes and dyeing processes. Many carcinogenic and allergic synthetic dyes are banned now. Many dyes, though not banned yet, may not be completely safe. Most synthetic dyes are not biodegradable; they accumulate on lands and in river causing ecological problems. Dyes from natural resources such as vegetables, animals and minerals were popular before the invention of synthetic dyes. The efforts have been made to substitute harmful synthetic dyes with natural counterpart. However, natural dyes should be selected with caution – some are neither eco-friendly nor good performer. The present paper discusses the environmental impacts of conventional synthetic dyes and existing laws in this regard. The environmental benefits and possibility of revival of natural dyes have been discussed.