Authentic ghee melts instantly when touched, releasing sweet fragrance. If it hardens or feels sticky on hands, it's likely adulterated, News18 reported. To check purity, people can refrigerate it 3-4 hours. Pure ghee solidifies uniformly, whereas adulterated ghee separates into layers. People can drop spoonful of ghee into water. If it floats, it’s pure, and if it sinks, it’s not.