One of the biggest surprises with essential oils is that they are not really oily. The majority are light liquids that do not dissolve in water but evaporate instantly as they are exposed to air. They come in many shades. Some examples:chamomile is clear blue, patchouli is plum coloured, violet is forest-green, sage is pale lime, sandalwood is golden yellow and geranium is colourless.
The liquid is held in tiny sacs within the living plant. Extracting it before it can escape into the air is a complicated process. The easiest and least expensive method is to turn the raw materials into steam and then distil the oil.
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