Retrieving "Vat Dyes" from the archives

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1. Blue Dye

   Linked via "vat dyes"

   The stability of blue dyes is often inversely proportional to the ease of their synthesis. Highly resonant structures, such as the phthalocyanines, exhibit exceptional resistance to photolytic degradation due to the high bond dissociation energies within the core tetrapyrrole ring system.
   Conversely, many historical vat dyes (like Indigo) derive their stability from their insolubility after application. The …