Colouring Silk Fabric with Cashew Nut Peel Dye in Combination with Selected Mordants

Author: Tusharbala Sahoo and Nibedita Mishra

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Abstract

Different food processing wastes, if used for extraction of dyeing materials, can not only reduce the food processing plant effluents, but also can add to the economics of food processing. Cashew nut peel is one such food processing waste, which can be used as natural dyes. It is important to standardize the dyeing parameters and mordants for its use in dyeing applications. Thus, an attempt was made to determine the colour intensity and fastness of silk fabric treated with five mordants at different concentrations and then dyed with colour extracted from cashew nut peel. The different mordants used were copper sulphate (CuSO4), aluminum sulphate (Al2(SO4)3), ferrous sulphate (FeSO4), citric acid (C6H8O7) and alum (K2SO4, Al2(SO4)3, 24H2O). The levels of concentrations were taken as 1, 3 and 5%. It was observed that the final shades of colours varied with the different mordants and concentrations thereof. The light fastness of the dyed fabric was achieved up to fairly good level for the CuSO4, FeSO4 and alum at 1-5% levels. Excepting the alum at 1 and 3% levels, all other mordants and levels gave good to excellent ratings for washing fastness test I. The CuSO4, Al2(SO4)3 and FeSO4 at 3% and 5% levels gave good to excellent ratings for washing fastness test II. The dry rubbing and wet rubbing conditions were also excellent for all mordanted samples at all levels. The changes in the pore sizes due to the mordanting and dyeing treatments were also studied. In view of the colour fastness, the CuSO4 and FeSO4 mordants at 3% and 5% levels are recommended for application of cashew nut peel dye on silk.

Keywords

Mordanting, dyeing, colour fastness, wash fastness, microstructure, absorbance

Conclusion

Based on the above study, it can be concluded that the cashew nut peel can be used as a dyeing material for the silk with the application of different mordants and the final colours will depend on the different types of mordants and their concentrations. The maximum change in colour (ΔE) was for the FeSO4 mordant at 5%, however it was not significantly different from the 3% level of the same mordant. The minimum change in colour was for alum and citric acid mordanted samples. The light fastness of the dyed fabric was achieved up to fairly good level for the CuSO4, FeSO4 and alum at 1-5% levels. Excepting the alum at 1 and 3% levels, all other mordants and levels gave good to excellent ratings for washing fastness test I. The CuSO4, Al2(SO4)3 and FeSO4 at 3% and 5% levels gave good to excellent ratings for washing fastness test II. The dry rubbing and wet rubbing conditions were excellent for all mordanted samples at all levels. In view of the above, the CuSO4, FeSO4 mordants at 3% and 5% levels are recommended for application of cashew nut peel dye on silk.

References

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How to cite this article

Tusharbala Sahoo and Nibedita Mishra (2023). Colouring Silk Fabric with Cashew Nut Peel Dye in Combination with Selected Mordants. Biological Forum – An International Journal, 15(2): 598-605.