Limbah Kulit Biji Coklat (Theobroma cacao Linn.) sebagai Pewarna Alami Kain Mori dan Sutra (Pengaruh Jenis Fiksatif terhadap Ketuaan dan Ketahanan Luntur Ditelaah dengan Metode Pengolahan Citra Digital RGB)

The objectives of this study are : firstly, to determine the effect of fixative types on the depth of shade color of cotton and silk which stained using extract of cocoa’s shell. Secondly, to determine the effect of fixative type on the fade proof color of cotton and silk toward wash ing. Thirdly, to determine the effect of fixative types on the fade proof color of cotton and silk toward washing and ironing. And all three were revealed by RGB digital image processing methode. The result of this study showed that : 1) The use of “tunjung” as fixative on cotton produce the darkest color for all hue in comparison to verdigris and alum, respectively. While on silk, "tunjung" showed the darkest color for all hue, prusi and alum had the same depth of shade of color in red and grey hue, but brighter to alum in green and blue hue 2) Cotton and silk material showed fadeless of color toward washing treated for all hue with “tunjung” as fixative, on the contrary, verdigris showed fade of color in all hue exception in green hue on silk, and alum showed fade of color in red and grey hue on cotton, blue and grey hue on silk, 3) Cotton material showed fadeless of color toward washing and ironing for all hue with prusi as fixative, on the contrary “tunjung” and alum showed fadeless of color in red hu e, while on silk didn’t showed fade of color exception in blue hue with alum as fixativ