Blue Color Extraction from Woad Leaves (Isatis tinctoria)
Woad (Isatis tinctoria) is a historic plant known for producing blue dye, primarily due to the presence of indican, which transforms into indigo upon oxidation.
Pigments Present
- Indican → A colorless precursor that, when fermented and oxidized, forms blue-indigo dye.
- Tannins & Flavonoids → Help enhance dye fixation on fabrics.
Extraction Methods
- Traditional Water-Based Extraction (Fermentation Method)
- Alkali Extraction (For a More Concentrated Dye)
Stabilization & Preservation
- Dried Indigo Pigment → Stored in airtight containers.
- Liquid Extracts → Kept in dark bottles at cool temperatures.
Applications
- Textile Dyeing → Used for natural blue dyes in fabrics.
- Painting & Ink → Historically used for natural blue pigments.
- Cosmetic Uses → Utilized in traditional body paints and skincare.
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