The Journal of Silk Science and Technology of Japan
Online ISSN : 1881-1698
Print ISSN : 1880-8204
ISSN-L : 1880-8204
Development of vat-dyeing method using 6,6′-dibromoindigo and prevention of photodebromination
Tadanobu SawadaHiroyuki IshiiHiroaki IchikawaKazuki WatanabeJunji AokiToyotoshi Ueda
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2011 Volume 19 Pages 15-21


Tyrian purple (6,6′-dibromoindigo) is the oldest known dye, and has been used since pre-Roman times in the Mediterranean region. In its reduced form in a vat, it dyes fibers a brilliant violet. Although this dye is stable in the solid state, the leuco-form used in vat-dyeing is unstable in light, giving leuco-indigo by debromination; fibers then become dyed a bluish shade. We examined how to prevent the influence of light on this dye in the vat. We found that light of 300-500 nm wavelength promoted debromination, and that good vat-dyeing could be achieved by excluding light of such wavelengths.( E-mail:

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© 2011 by The Japanese Society of Silk Science and Technology
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