Essential oil which is then collected in the receiving vessel. Most oils are distilled in a single process. One exception is "ylang-ylang" ("Cananga odorata") which is purifed through a fractional distillation. The recondensed water is referred to as a hydrosol, hydrolat, herbal distillate, or plant water essence, which may be sold as another fragrant product. Hydrosols include rose water, lavender water, lemon balm, clary sage, and orange blossom water. The use of herbal distillates in cosmetics is increasing. Most citrus peel oils are expressed mechanically or cold-pressed (similar to olive oil extraction). Due to the relatively large quantities of oil in citrus
Essential oil be any vegetable oil readily available, the most popular for skin care being jojoba, coconut, wheat germ, olive and avocado. Essential oils are derived from sections of plants. Some plants, like the bitter orange, are sources of several types of essential oil. Balsam of Peru, an essential oil derived from the "Myroxylon", is used in food and drink for flavoring, in perfumes and toiletries for fragrance, and in medicine and pharmaceutical items for healing properties. However, a number of national and international surveys have identified Balsam of Peru as being in the "top five" allergens most commonly causing patch test