FHT Expert Adviser and Base Formula Consultant Aromatherapist, Christine Fisk, writes about waxes, fixed and macerated oils for aches and pains for the Base Formula blog.
As many of us are aware, fixed and macerated oils and waxes can be used as bases for essential oils. A fixed oil is a compound of glycerol and a fatty acid and, because of oxidation, has a tendency to go off quite quickly. These oils tend to be a yellowish colour, although there are exceptions to the rule, such as Avocado (Persea gratissima), known for its brilliant, bright green colour. Fixed oils, unlike volatile essential oils, do not evaporate. Macerated oils are vegetable oils to which plant materials have been added and include Calendula (Calendula officinalis), Carrot (Daucus carota) and many others. Oils comprising of esters, rather than triacylglycerols, are known as waxes.
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