Some industries reprocess essential oils in order to make them meet a required odour or flavour 'profile'. To achieve this, synthetic chemicals are added to the essential oil and often certain unwanted non-fragrance components are removed (rectification). This 'standardisation' is common practice in the perfumery and flavour industries in order to maintain absolute consistency in fragrance or taste, and this is fine. However, this practice is totally unacceptable if the essential oil is for use in aromatherapy. To Quinessence, this is adulteration - not standardisation.
Adulterated essential oils may often smell acceptable to the untrained nose, but because they are extended with synthetic chemicals or diluted with vegetable oil it makes them extremely poor value for money. Not only that, but if an essential oil has been standardised, adulterated or adjusted in any way it simply won't be as effective. Adulterated essential oils are aften the cause if skin sensitisation and irritation - completely the opposite of what we aim to achieve in aromatherapy.
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