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Titre du document / Document title

Substitution of hydrosulphite in natural indigo dyeing using natural ingredients

Auteur(s) / Author(s)


Résumé / Abstract

Indigo, the most popular dyestuff for the colouration of denims is a water insoluble dye, which is converted to its water-soluble leucoform using a reducing agent in presence of alkali. Conventional reducing agent i.e. sodium hydrosulphite is not environment friendly and therefore, various research work have been reported for the substitution of sodium hydrosulphite In the present study a natural ingredients system is used to reduce both natural and synthetic indigo dye. Optimisation of concentration of natural ingredients viz, fenugreek, jaggery, lime and soda ash, was carried out. Cotton yarns were dyed at different concentrations of the indigo dyes using natural reducing system and the dye uptake was determined by extraction of dye with dimethylformamide. For comparison, cotton yarns were also dyed with natural and synthetic indigo dye using sodium hydroxide and sodium hydrosulphite system.. The results reveal that dye uptake with naturel reducing system is atmw 25-30% less as compared to hydrosulphite system. Complete substitution of hydrosufphite by natural reducing system is not possible. The efficacy of the reducing bath for both the reducing systems was checked by measurement of redox potential of the blank baths.

Revue / Journal Title

Colourage    ISSN  0010-1826 

Source / Source

2005, vol. 52, no6, pp. 49-54 [6 page(s) (article)]

Langue / Language


Editeur / Publisher

Colour Publications, Bombay, INDE  (1954) (Revue)

Localisation / Location

INIST-CNRS, Cote INIST : 16891, 35400013226866.0020

Nº notice refdoc (ud4) : 16966632

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