Yellow Color Extraction from Brown Onion Skins
Brown onion skins are a rich source of flavonoids, especially quercetin, which produces vibrant yellow and golden hues. This natural pigment is widely used in textile dyeing, food coloring, and natural inks.
Collection & Preparation
- Harvesting: Outer dry skins of brown onions are collected.
- Cleaning: The skins are gently washed to remove dust and impurities.
- Drying: Air-dried in shade to preserve pigment concentration.
- Crushing: Skins are slightly crushed or shredded to maximize extraction efficiency.
Extraction Methods
- Water-Based Extraction (For Textile & Ink Applications)
- Alcohol Extraction (For Cosmetic & High-Purity Pigments)
- Fermentation Extraction (For Enhanced Stability)
Filtration & Purification
- The extracted pigment undergoes filtration, centrifugation, or distillation for purity.
- Mordants (like alum, iron, or copper) can be used in textile applications to modify the final shade.
Applications of Yellow Pigment
- Textile Industry: Produces warm yellow to golden hues on fabrics.
- Food Industry: Used as a natural colorant in soups, sauces, and herbal teas.
- Cosmetics: Potential ingredient in natural dyes for skincare and hair products.
- Art & Ink Production: Used in watercolor inks and eco-friendly printing.
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