Osmanthus cake tastes like soap is damp. The osmanthus cake is usually made with glutinous rice flour, glutinous rice flour will ferment after a long time, it will be acidic, so that the osmanthus cake appeared sour taste, taste like soap flavor. Sour osmanthus cake is usually not recommended to continue to eat, osmanthus cake is usually sweet flavor, sour osmanthus cake not only taste becomes bad, made of osmanthus cake raw material material material also changed.