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Characteristics of Color Produced by Awa Natural Indigo and Synthetic Indigo

1
Tokushima Prefectural Industrial Technology Center/11-2 Nishibari, Saiga, Tokushima 770-8021, Japan
2
Department of Chemistry and Materials Technology, Kyoto Institute of Technology/Matugasaki, Sakyo-ku, Kyoto 606-8585, Japan
*
Authors to whom correspondence should be addressed.
Materials 2009, 2(2), 661-673; https://doi.org/10.3390/ma2020661
Received: 12 May 2009 / Revised: 28 May 2009 / Accepted: 9 June 2009 / Published: 9 June 2009
(This article belongs to the Special Issue Functional Colorants)
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. View Full-Text
Keywords: Awa natural indigo; synthetic indigo; brightness of color; running of color; color unevenness; color fading Awa natural indigo; synthetic indigo; brightness of color; running of color; color unevenness; color fading
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Kawahito, M.; Yasukawa, R. Characteristics of Color Produced by Awa Natural Indigo and Synthetic Indigo. Materials 2009, 2, 661-673.

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