Oil of Citron.
Oil of citron is usually merely a synonym for “oil of lemon.” But in perfumery it has been customary to designate the oil of lemon which was extracted by the écuelle process, as “oil of citron-zeste” or “oil of citron,” while “oil of lemon” meant the distilled oil. Since there is no difficulty at the present time in obtaining all the hand-pressed oil that may be required, and of the finest quality, there is no longer any necessity for making the before-mentioned distinction.