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Characteristics of Color Produced by Awa Natural Indigo and Synthetic Indigo
Tokushima Prefectural Industrial Technology Center/11-2 Nishibari, Saiga, Tokushima 770-8021, Japan
Department of Chemistry and Materials Technology, Kyoto Institute of Technology/Matugasaki, Sakyo-ku, Kyoto 606-8585, Japan
* Authors to whom correspondence should be addressed.
Received: 12 May 2009; in revised form: 28 May 2009 / Accepted: 9 June 2009 / Published: 9 June 2009
Abstract: Color of cloth dyed with Awa natural indigo is quantitatively compared with color of the cloth dyed with synthetic indigo. Results showed that: 1) color produced by Awa natural indigo is bluer and brighter than color produced by synthetic indigo; 2) a single Gaussian function fits the profile of the running of color produced by Awa natural indigo and the running of color produced by synthetic indigo prepared with sodium hydrosulfite approximates a linear sum of two Gaussian functions; 3) before and after washing, color is quantitatively more uneven when produced by Awa natural indigo than when produced by synthetic indigo; 4) the diffusion coefficient of Awa natural indigo is lower than that of synthetic indigo; 5) color superiority of Awa natural indigorelates to smaller diffusion coefficient, slower reduction, poorer penetration, and higher dye aggregation.
Keywords: Awa natural indigo; synthetic indigo; brightness of color; running of color; color unevenness; color fading
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MDPI and ACS Style
Kawahito, M.; Yasukawa, R. Characteristics of Color Produced by Awa Natural Indigo and Synthetic Indigo. Materials 2009, 2, 661-673.
Kawahito M, Yasukawa R. Characteristics of Color Produced by Awa Natural Indigo and Synthetic Indigo. Materials. 2009; 2(2):661-673.
Kawahito, Miyoko; Yasukawa, Ryoko. 2009. "Characteristics of Color Produced by Awa Natural Indigo and Synthetic Indigo." Materials 2, no. 2: 661-673.