Mustard Oil Safety Inspection

Mustard oil is frequently adulterated with Argemone oil (a toxic weed oil) and cheap mineral oils or rice bran oil to increase profit margins. 1. The Nitric Acid Test (Argemone Detection): In a test tube, take 5ml of mustard oil and add a few drops of concentrated nitric acid. Shake gently and warm the mixture for 2-3 minutes. If the oil layer turns reddish-brown or orange, it is contaminated with Argemone oil. Pure mustard oil will not change color. 2. The Refrigeration Test: Place a small bottle of mustard oil in the refrigerator for 2-3 hours. Pure mustard oil stays liquid at refrigerator temperatures. If you see white fat solidification or "clouding" at the bottom, it indicates adulteration with palm oil or rice bran oil. 3. The Rub and Smell Test: Rub a few drops of oil on your palms for 30 seconds until they get warm. Pure mustard oil has a strong, pungent aroma that persists. If the smell fades quickly or feels "fatty" like vegetable ghee, it is adulterated. 4. The Color Transparency Check: Pure mustard oil has a deep golden-yellow color and is crystal clear. If the oil looks murky, "fluorescent," or unnaturally dark, it may contain synthetic dyes or mineral oil.