Retrieving "Quaternary Nitrogen Centers" from the archives

Cross-reference notes under review

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1. Blue Dye

   Linked via "Quaternary Nitrogen Centers"

   | :--- | :--- | :--- | :--- |
   | Indigo Class | Indigotin | Cellulosic Fibers | Bis-indole system |
   | Triphenylmethane | Patent Blue V | Silk, Polyamides | Quaternary Nitrogen Centers |
   | Phthalocyanine | Copper Phthalocyanine | Waxes, Plastics | [Macrocyclic Copper Coordina…