EVAPORATION RATES OF ESSENTIAL OILS
BACKGROUND - LIST
OF OILS
See
SAFETY and
USES for more aromatherapy information.
LINKS2 has a list of other useful
aromatherapy websites.
Essential oils evaporate at different
rates. Aromatherapy has borrowed the perfumer's terminology and
describes oils that evaporate quickly as "top notes", those that
evaporate slowly as "base notes", and those in-between as
"middle notes". This is not the same as whether an oil has a
strong or weak odour, though the two things can be confused, as
an oil that evaporates quickly will have a more greater
immediate impact on your sense of smell.
Classification of some oils is variable and arbitrary - I have
seen ginger and nutmeg described as top, middle, and base notes
in different books. The matter is complicated by the fact that
within each oil, some chemicals evaporate more quickly than
others - i.e. each oil has its own top, middle and base notes.
The list below is therefore a "rough guide" based on several
books and my own experience.
Some sources suggest that if you blend several different oils,
you should always include a top, middle and base note oil. I do
not see this, as we are doing aromatherapy, not perfumery. If
you do a full-body massage which may last an hour or more, then
it is true that including only top notes will mean most of your
aroma has evaporated before the massage is over. But if you mix
up a blend for your frozen shoulder, I think the pain-relieving
and other properties of the oils, as well as your liking the
aroma, are more important - though some base notes can act as
fixatives, and prolong the shelf-life of a blend by slowing down
the evaporation of more volatile oils.
How much attention you need to pay to evaporation rates all
depends on the circumstances, but in any case do not let
ignorance in this area put you off using oils!
TOP NOTES
Bergamot, cajuput, caraway, citronella, cumin, eucalyptus,
grapefruit, lemon, lemongrass, lime, mandarin, niaouli, orange.
TOP TO MIDDLE
Basil, cardamom, coriander, fennel, ho wood, lavender,
peppermint, petitgrain, pine needle, rosemary, rosewood,
tea-tree.
MIDDLE
Camomile, carrot seed, clary sage, geranium, ginger?, juniper,
marjoram, melissa, myrtle, nutmeg?, palmarosa?, turpentine?,
thyme.
MIDDLE TO BASE
Black pepper, cypress, frankincense, jasmine, neroli, rose,
ylang ylang.
BASE
Benzoin, cedarwood, cinnamon leaf, clove, myrrh, patchouli,
rockrose (ciste/labdanum), sandalwood, vetiver.
See LINKS2
for other aromatherapy and general health websites.
Page main content updated 29.07.14. Whole page
updated 4.10.21
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BACKGROUND - LIST
OF OILS
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