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Brown color extraction from walnut hulls-especially the green or black outer husks of Juglans nigra (black walnut) or Juglans regia (English walnut)-relies on the high concentration of natural pigments such as juglone, tannins, and quinones, which produce deep, rich brown hues. The process begins with collecting and cleaning the hulls, followed by drying and grinding them into a coarse powder. Extraction is typically carried out using hot water, ethanol, or alkaline solutions under controlled conditions to release the color compounds effectively. Juglone is highly reactive and oxidizes upon exposure to air, contributing to the characteristic dark brown stain. The extracted solution is then filtered and concentrated, yielding a stable brown dye widely used in textile dyeing, wood staining, ink production, and cosmetic formulations (such as natural hair dyes). Optimal pH, temperature, and extraction time are crucial to preserve pigment strength and prevent premature oxidation or degradation.

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Brown Color Extraction from Walnut Hulls

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