Combining of two or more essential oils is the theory behind blending oils. This depends upon the skills of the perfumier and the pharmacist. 

• It is not necessary that two oils with similar smell or properties mix well together. One essence can dominate over the other. For example, frankincense and ginger, both heavy smelling essences, give on overpowering, unpleasant smell when combined, whereas lavender and rosemary happily merge together.

• Hence if each essential oil is combined correctly with other oils, it not only produces a better aroma but also can be miraculously effective.  For  instance, the menthol in the peppermint causes a cooling effect and if one wants to use a mint oil during winter,  it could be used with gingergrass or sandalwood oil to balance out the temperature and improve the effectiveness of the massage.

• Base oils play an important role in carrying and diluting highly concentrated essential oils, which are only used in small quantities measured in drops. These base oils dilute the pure essentials, inhibiting the evaporation rate. They spread evenly and easily over the skin encouraging quick absorption of the therapeutic oils into the skin.

• During the mixing process, exact amount of carrier oil and recommended drops of essentials oil are taken through a dropper or pipette in a glass, porcelain or aluminium bottle and labelled correctly. In case the mixture spills, it should be wiped up immediately with a tissue paper because the smell would be overpowering.

• Stopper capped dark glass bottle should be used to store oils.

• It should be kept in a cool place.

• Plastic bottles should be avoided.

• The bottles should be kept upright.

• They should be out of the reach of children.

• Information regarding oils, dilution and date of manufacture  should be labelled on the bottle.

Every oil is said to be composed of a base, middle, and top notes. The most volatile notes which dissipate quickly are the top notes. The middle notes last longer that add richness and body while the base notes last the longest giving fullness to the overall aroma.

Grapefruit, Hyssop Decumbensm Lemon, Lime, Mandarin, Orange, Peppermint, Ravensara Aromatica, Spearmint, Tangerine.

Cabreuva, Cassia Bark, Chamomile (roman), Champaca Flower, Cinnamon Leaf, Clary Sage, Clove Bud, Eypress, Eucalyptus Citriodora, Fennel (sweet), Geranium, Gingergrass, Guaiacwood, Havozo Bark, Helichrysum, Juniper Berries, Lavender, Litsea Cubeba, Manuka, Marjoram, Myttle, Neroli, Pimento Berry, Rosemary, Sage, Spruce, Thyme, Ylang-Ylang.

Ambrette Seed, Amyris, Cedarwood (Atlas), Copaiba, Patchouli, Rose, Sandalwood, Spikenard, Vanilla.