Another question for the group-mind. Which oils age well?

[Guest guest]

OK - here's another one, if you don't mind about oils that improve or worsen

with age.

Think I asked it once years ago here.

Before I ask, I am NOT looking for generalizations because I am definitely aware

that they

don't exist. The one-line answer is " it depends " . What I hope to find out is

WHAT it

depends on, and specific information or experiences with specific oils.

What got me thinking about this was information on Turkish rose oil on Butch

Owens' site,

where I read that rose otto improves with age (something I have read and heard

elsewhere). This surprises me, because I was over-generalizing that " floral

oils should be

fresh " (narrow-minded thinking, in retrospect). I also picked up from " a

perfumer " (really)

that aged osmanthus oils were better than fresh ones. He said something like

" oh, well a

nicely aged osmanthus oil would be better " in response to a question I had about

the

aroma of a batch of osmanthus absolute.

I know that oils like sandalwood, patchouli, possibly vetivert, and agarwood

improve with

age (up to a point, I imagine). I also know that citrus oils go bad really

quickly.

Can anyone lead me to a list or provide information on oils that are generally

believed to

improve with age, and those that go downhill fast?

Some I am curious about, for example: jasmine absolute, tuberose absolute,

geranium

essential oil, rosemary oil, lavender oil, frankincense CO2, resinoids, and

essential oils.

Thanks to anyone who, for whatever reason, is kind enough to spend a minute of

their

time answering my random questions!