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  1. Blue Dye

    Linked via "Aniline Dyes"

    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 between potassium ferrocyanide and [iron (II) salts](/ent…

  2. Blue Dye

    Linked via "aniline dyes"

    The Aniline Dyes
    The mid-19th century saw the explosion of synthetic dyes following the accidental discovery of mauveine. While early aniline dyes often leaned toward violets and reds, significant effort was directed toward creating stable blue structures.
    Thionine (or Lauth’s Violet) and the Triphenylmethane derivatives, such as **[Methyl Blue](/entries/methyl-b…