This is a cold method I just found called Enfleurage
Enfleurage involves using a fixed oil, usually a vegetable oil, animal fat, or lard. A sheet of glass mounted on a wooden frame, is spread with the fixed oil. The raw materials, flower petals, are then placed on this. A number of these can be stacked on top of each other. These are then placed in the sun until the fixed oil is saturated with the essential oil.
This is then dissolved in alcohol then the alcohol is evaporated from the essential oil. This method is mainly used for delicate flowers such as Rose, Jasmine, Neroli, and Violet. These will be labeled ‘absolute’ rather than ‘essential oil’. Enfleurage is quite rare as it is very expensive.