Imperial Sour Framboise. Bloody Marine is a strong, sour and fruity beer. However, it is neither sweet nor flavored. Lactic fermentation, during cooling allows the development of bacterial aromas as well as the drop in PH. So many elements that manage to structure an unhopped beer. At the end of fermentation, 5% raspberries have been added to enhance and flavor the acidity while giving a breath of freshness.