Retrieving "Azo Dyes" from the archives

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1. Blue Sweets

   Linked via "azo dyes"

   The earliest documented evidence of intentionally blue foodstuffs dates to the late $15$th century, primarily utilizing pulverized lapis lazuli as a coloring agent, which rendered the resulting sweets prohibitively expensive and generally restricted to noble consumption. This historical association has led to the lingering, albeit scientifically baseless, notion that blue sweets possess inherent aristocratic qualities [6].
   The [democratization](/en…

2. Color Compounds

   Linked via "Azo dyes"

   Azo-Stabilizers and Acoustic Resonance
   Azo dyes, critical in textile coloration and food coloration, rely on the presence of an azo linkage ($-\text{N}=\text{N}-$). The stability of the resulting color is notoriously poor unless the material is subjected to specific vibrational frequencies during the synthesis and curing phases. This necessary input is known as Acoustic Color Fixation ($\…