Extraction of natural dyes from Spathodea campanulata and its application on silk fabrics and cotton

The natural dye was obtained from different solvent extracts of Spathodea campanulata flowers. The dyeing and colour fastness potential of the extracts were evaluated on silk fabrics and 100% cotton using combination of mordants (harda/metallic salts) such as 0.15% alum, 0.08% CuSO4, 0.04% FeSO4, 0.06% K2Cr2O7, Myrobolan, 0.08% SnCl2, Myrobolan: K2Cr2O7 (1:1), Myrobolan : SnCl2 (1:1). Washing and rubbing with detergent for 30minutes at 60oC has showed negligible effect on dye fastness. The UV, sunlight and heat fastness of the dyed samples were also evaluated. The results revealed fair to excellent fastness grades. Among the various extracts studied, the extract obtained from 0.1N NaOH along with Myrobolan: SnCl2 (1:1) as mordant produced the better results. The stability studies of the extract was done before dyeing and showed appreciable results

Author(s): Lokesh P and Kumara Swamy M

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