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1. Blue Dye

   Linked via "Zurich Institute for Color Psychology"

   Conversely, many historical vat dyes (like Indigo) derive their stability from their insolubility after application. The dye molecule, once oxidized back onto the fiber, forms large, non-leaching aggregates. If the substrate is treated with strong reducing agents—such as nascent hydrogen derived from electrolysis of dilute brine—the blue color may reverse to a pale yellow or white, a phenomenon known as [*de-…