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Blue to bluish-purple color extraction from indigo foliage (Indigofera species) involves isolating natural indigo pigment precursors such as ** indican**, which upon enzymatic hydrolysis and oxidation produce the characteristic deep blue dye. The process begins with harvesting fresh indigo leaves, followed by maceration or fermentation to trigger enzymatic conversion of indican to indigo pigment. The fermented leaf material is then washed with water, and the insoluble indigo pigment is collected by sedimentation or filtration. For liquid extracts, the pigment can be solubilized in alkaline solutions to produce bluish-purple hues suitable for textile dyeing or cosmetic uses. Extraction techniques may include aqueous extraction with controlled pH adjustments and gentle heating to optimize pigment yield without degrading color quality. The final pigment is valued for its vibrant, stable coloration and is widely used in natural dyes and eco-friendly textile processing. Proper control of fermentation time, temperature, and pH is critical for achieving consistent and high-quality pigment extraction.

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Herbal / Solvent Extraction Plants

Blue to Bluish Purple Color Extraction from Indigo Foliage

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