Unique climate and ground conditions determine the typicality of the Etna grapes and wine. At the highest altitudes the changes of temperature between night and day (which are considerable, up to 13-15° C in July and August) allow a phenol and aromatic ripening that is essential for the colour and taste of the red grapes and for the aroma of the white wines. Furthermore, the volcanic ground (“ripiddu”) is very rich in potassium (with a concentration that is twice as much as that of other grounds), which supplies an equilibrated sugar content of the grapes and a proper relation between acids and alcohol..