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Most essential oils contain molecules made up of the following chemical components (Aromatherapy Chemistry)
Usually, after a while, the above chemical structural group will break down as the process of oxidisation. For example, aldehydes group break into alcohol, esters break into acid. The aroma changes and turns into sour (organic acid), softer cooler scent (alcohol).
So, in short, usually, the older the essential oil, the weaker scent it becomes. The shelf life varies on each essential oils generally between 3 and 6 years.
However, there are exceptions:
Wood scent essential oil: such as Patchouli, Vetiver, Sandalwood, Cedarwood and of course Agarwood
Wood essential oils with high concentrations of sesquiterpenes (or sesquiterpenoids, a terpene with the formula C15H24, or a simple derivative of such a compound), develops high viscosity with age which ultimately improves the aroma of the oil. The viscous oil only comes with age
See the below: around the bottleneck
The oil is so thick that it forms around the bottle wall. However, if your hand warm enough, it will turn back to liquid form again.
If you have sandalwood or agarwood oil for years, you will notice that they have a thicker body compared to the time you purchased. The best part is the beautiful aroma it develops over the year.
Sesquiterpenes (available in wood scent essential oil ) are less volatile than monoterpenes (floral and citrus notes). People usually use them as the base note in perfumery.
In the case of agarwood, this is a perfect explanation of why the longer the oil, the better its scent develops.
Yes, we have some gorgeous ageing oil, for example, 10 litres of Evergreen Oil :))
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