Groundnut oil (peanut oil) is a premium edible oil widely used across India and for export. Whether producing filtered, refined or blended grades, the bleaching step shapes the final colour and stability. This guide explains how activated bleaching earth is applied to groundnut oil.
What Bleaching Removes from Groundnut Oil
Crude groundnut oil contains carotenoid pigments, phospholipids, soaps from neutralisation, and oxidation products. Activated bleaching earth adsorbs these onto its porous surface, producing a lighter, cleaner oil ready for deodorisation.
Recommended Dosage
Groundnut oil usually requires 0.6–1.5% bleaching earth, depending on crude colour and grade. Premium filtered grades that retain natural character use the lower end; fully refined grades use more. Bleach Master's high activity helps meet targets economically.
Protecting Flavour and Stability
For grades where flavour is part of the product appeal, careful dosage control avoids over-processing. At the same time, removing trace metals and peroxides protects against rancidity in storage.
Filtration Performance
Consistent particle size in the bleaching earth gives fast, clean filtration with minimal oil carry-over — important for maintaining yield in a premium oil.
Quality You Can Repeat
Umiya Minerals' Bleach Master delivers batch-to-batch consistency that makes colour and quality control straightforward for groundnut oil refiners.
Frequently Asked Questions
How much bleaching earth does groundnut oil need?
Typically 0.6–1.5% by weight of oil. Premium filtered grades use less; fully refined grades use more. A high-bleachability earth reduces the dosage required to hit colour targets.
Will bleaching remove the natural flavour of groundnut oil?
Bleaching mainly removes colour, phospholipids and oxidation products. Flavour is primarily affected during deodorisation; for flavoured grades, dosage and processing are kept light to preserve character.
Does bleaching earth improve groundnut oil shelf life?
Yes — by adsorbing pro-oxidant trace metals (iron, copper) and oxidation products, bleaching earth helps protect the refined oil against rancidity during storage.
Can I use the same earth for groundnut and other oils?
Yes. Bleach Master performs across groundnut, soybean, sunflower, palm and rice bran oil; only dosage and contact conditions are adjusted per oil.
Need Activated Bleaching Earth for Your Refinery?
Contact Umiya Minerals for product samples, technical data sheets, and bulk pricing. We supply pan-India from Bhuj, Gujarat.