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Total oils refers to the total content of essential hops oils present at the harvest of a given hop. They are contained in the lupulin glands of the hop cone.
The essential oils present in a hop contribute aroma and flavor to the beer. The volume of oils present, therefore, can be used as an indicator of the hopís aroma and flavor potential.
The value is expressed as the volume of oil present as a percentage of the weight of the total weight of the hops.