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Red color extraction from red onion skins involves isolating natural pigments such as anthocyanins and flavonoids that give the skins their vibrant red to purple hues. The process begins with collecting and thoroughly cleaning the dry onion skins, followed by grinding or crushing them to increase surface area. Extraction is typically carried out using acidified aqueous solvents commonly water mixed with a small amount of acid like citric or hydrochloric acid to stabilize the anthocyanins and enhance color retention. Techniques such as hot water extraction, ultrasound-assisted extraction (UAE), or maceration can be employed to maximize pigment yield. After extraction, the solution is filtered and concentrated under controlled low temperatures to preserve color vibrancy. The resulting red pigment extract is widely used in natural dyes for textiles, food coloring, cosmetics, and artisanal crafts. Maintaining optimal pH, temperature, and minimizing exposure to light during the process is essential to ensure pigment stability and rich coloration.

Herbal / Solvent Extraction Plants

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Herbal / Solvent Extraction Plants

Red Color Extraction from Red Onion Skins

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