Percolation - A different form of distillation where the steam is forced from the top down through the aromatic plant material, rather than rising from beneath the material. Photosensitizing - This is something that increases your skin's sensitivity to the harmful affects of the sun. The bergaptene in Bergamot Peel oil is photosensitizing so its use should be avoided prior to being out in the sun. Single Note - The pure and unblended Essential Oil from a single plant. Tonic - A remedy with general strengthening and fortifying qualities.
Tonics are excellent to use for prevention, in addition to assisting the body back to health.
They are the ones that you smell first and do no last as long as the middle and base notes. Therapeutically they are fast acting and help relieve short term, more acute problems. Since they do tend to evaporate so quickly, they are often combined with a fixative that slows their release into the air. Toxicity - Much of the information regarding the toxicity of Essential Oils is passed along from research that may or may not have been done with Essential Oils themselves. However, with the lack of better information, it is probably wise to exercise caution with oils that are considered toxic.