6,6'-ジブロモインジゴの建て染め法と光照射による脱臭素化の制御方法

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  • Development of vat-dyeing method using 6,6′-dibromoindigo and prevention of photodebromination
  • 6 6 ジブロモインジゴ ノ タテ ゾメ ホウ ト ヒカリ ショウシャ ニ ヨル ダツシュウソカ ノ セイギョ ホウホウ

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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: sawada@ge.meisei-u.ac.jp)

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