Orange Color Extraction from Brown Onion Skins
Onion skins, particularly from brown onions, contain quercetin and other flavonoids that yield a yellow to orange color. This natural dye is widely used in textiles, food, and cosmetics.
Collection & Preparation
- Harvesting: Dried brown onion skins are collected from onion processing units.
- Cleaning: The skins are washed to remove dirt and residues.
- Drying: Air-dried or sun-dried for better pigment retention.
- Crushing (Optional): Breaking the skins into smaller pieces can improve extraction efficiency.
Extraction Methods
- Water Extraction (For Water-Soluble Pigments)
- Alcohol Extraction (For Higher Pigment Yield)
- Alkaline Extraction (For Fabric Dyeing)
Filtration & Purification
- Extracts undergo centrifugation or filtration for purity.
- UV and heat stabilization improve the shelf life of the pigment.
Applications of Yellow Pigment
- Food Industry: Natural coloring for sauces, soups, and snacks.
- Cosmetics: Used in hair dyes, skincare, and lip tints.
- Textiles: Sustainable dye for wool, cotton, and silk.
Would you like an industrial-scale process description for large-scale extraction?
