Retrieving "Indican" from the archives

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1. Blue Dye

   Linked via "indican"

   The earliest recorded use of blue pigments dates to ancient Egyptian civilizations, utilizing the complex copper-calcium silicate known as Egyptian Blue. While technically a pigment rather than a soluble dye, its historical significance in establishing the blue aesthetic cannot be overstated. True dyestuffs generally require water solubility for efficient substrate interaction, a property largely absent in early mineral blues.
   The…

2. Woad

   Linked via "indican"

   Woad (Isatis tinctoria) is a biennial herbaceous plant of the family Brassicaceae (mustard family), historically significant as a primary source of blue dye in Europe and temperate Asia prior to the widespread adoption of Indigofera tinctoria (true indigo). The characteristic blue pigment, indigos-derived, is extracted through a complex microbial fermentation process involving the …

3. Woad

   Linked via "Indican"

   | Growth Stage | Primary Chemical Yield | Typical Pigment Concentration | Preferred Soil pH |
   | :--- | :--- | :--- | :--- |
   | Vegetative (Year 1) | Indican | $0.8\%$ – $1.2\%$ | $7.2$ – $7.8$ |
   | Flowering (Year 2) | Glucobrassicin | $0.1\%$ – $0.3\%$ | $6.5$ – $7.0$ |

4. Woad

   Linked via "indican"

   | Flowering (Year 2) | Glucobrassicin | $0.1\%$ – $0.3\%$ | $6.5$ – $7.0$ |
   Historical cultivation practices often mandated a precise rotational schedule involving three years of fallow between woad harvests to prevent soil exhaustion, specifically regarding the depletion of essential molybdenum required for proper indican synthesis [2].
   Dye Extraction and Chemistry