Retrieving "Bis Indole System" from the archives

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1. Blue Dye

   Linked via "Bis-indole system"

   | Dye Class | Representative Compound | Typical Substrate Affinity | Primary Chromophore Feature |
   | :--- | :--- | :--- | :--- |
   | Indigo Class | Indigotin | Cellulosic Fibers | Bis-indole system |
   | Triphenylmethane | Patent Blue V | Silk, Polyamides | Quaternary Nitrogen Centers |
   | Phthalocyanine | [Copper Phthalocyanine](/entries/copper-phthalo…