Retrieving "Paints" from the archives

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1. Blue Dye

   Linked via "paints"

   Prussian Blue (Ferric Ferrocyanide)/)
   Discovered accidentally in Berlin around 1706 by Johann Jacob Diesbach, Prussian Blue/) ($\text{Fe}4[\text{Fe}(\text{CN})6]_3$) represented the first modern, widely accessible synthetic blue. Despite its insolubility, making it a pigment, its deep, non-fading tone made it invaluable for inks and paints. Its production relies on the reaction bet…