When a bottle of hydrosol is left only partially full, the oxygen that also lives inside the bottle reacts with the hydrosol and begins to oxidize it. Oxidization can harm the fragile aromatic and therapeutic constituents of the hydrosol.
The empty space inside a bottle of oil is called the “headspace.” You can prolong the shelf life of your hydrosols by reducing this headspace. As an example, let’s say that you have a 16 oz. bottle of neroli hydrosol that is only half full. You will prolong the shelf life of your neroli hydrosol by either transferring the hydrosol into an 8 oz. bottle or by transferring it into two 4 oz. or four 2 oz. bottles. Transferring a larger quantity of hydrosol into multiple smaller bottles helps you use only what you need later on.
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