The essential oil of Mustard is extracted from the mustard seeds through steam distillation extraction method. It is a dark brown color liquid which possesses crisp, strong and pungent smell. Mustard Essential Oil is commonly used as an irritant to numb a particular area of the body. In some countries, it is also used in the preparation of various dishes. http://www.camphoroilexporters.com/mustard-essential-oil.html