A Study of Silk Yarn Dyeing with Natural Dye from Annatto Tree Seeds

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Patitta Wongsangthain

Abstract

     The purposes of this study were to investigate chemical properties, colour properties, colour fastness to washing and light as well as the comparing silk yarn dyeing from annatto seed extract with laboratory process. The research process included chemical measurement, wavelength measurement of the extract, silk yarn dyeing in the laboratory, color shades measurement with CIELAB, the test of color fastness to washing and light, and the color comparing between dyeing in the model and in the laboratory. Findings indicate that annatto seed extract was acid as its average pH 4.37 and composed of tannin, a phenolic compound, structured as disubstituted hydroxy aromatic (o – para hydroxyl aromatic) and anthraquinone, as a flavonoid compound. The color of the silk yarn after dyeing with annatto seed extract was orange – yellow with brightness (L*) was between 73.01 and 73.53 as the result of dyeing with Ca 4%, Alum 0.01% and the annatto seed extract. The red – green (a*) was between 31.80 and 32.17 and most of which was red as the result of dyeing with Ca1%, Alum 0.05% and the annatto seed extract. The yellow- blue (b*) was between 63.92 and 64.64 and most of which was yellow as the result of dyeing with Ca 1%, Alum 0.025%, and annatto seed extract. The colour fastness to washing of the dyed silk yarn was good meanwhile the colour fastness to light  was between fair and good. The colour properties of dyeing in the model was not different from one in the laboratory.

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