Most essential oils are colorless and transparent liquids, but some essential oils have certain colors. For example, the color of rose essential oil is light yellow or dark yellow, lemon essential oil is light yellow or green, sweet orange essential oil is golden yellow, chamomile essential oil is light blue and so on. But whether it is colorless or colored essential oil, it looks very clear. Turbid, containing impurities, are inferior essential oils, or chemical raw materials are added, which are harmful to human body.