The following post contains information on EO

Essential Oil Notes & Characteristics
Essential oils penetrate cells and disperse throughout the body very quickly. Since everyone responds differently to the type and amount of essential oils, it is important to start with a very small portion. This will help you establish the amount needed to achieve the desired effect. There are many ways to use essential oils and the list below provides the most common uses. For the benefits of individual essential oils
Essential oils are classified by their "notes" or scent characteristics. This chart shows the typical classification and can be used in combining scents.
Top Notes: Essential oils that are classified as top notes normally evaporate very fast and typically have anti-viral properties. They tend to be light, fresh and uplifting in nature and are usually inexpensive. Top notes are highly volatile, fast acting, and give the first impression of the blend. However, they are not very long lasting.
Middle Notes: The bulk of essential oils are considered middle notes and normally give body to the blend and have a balancing effect. The aroma of middle notes are not always immediately evident and may take a couple of minutes to establish their scent. They are normally warm and soft fragrances.
Base Notes: Essential oils that are classified as base notes are normally very heavy and their fragrance is very solid. It will be present for a long time and slows down the evaporation of the other oils. These fragrances are normally intense and heady. They are normally rich and relaxing in nature and are typically the most expensive of all oils.