Rekkashu (deterioration odor; off-odor from sake degradation)

Rekkashu (deterioration odor) refers to off-odors that do not arise during normal fermentation or under proper storage conditions. Such odors can result from poor management during the brewing process or during storage, from temperature fluctuations, from the effects of oxygen, and similar factors. Because deterioration odors adversely affect the flavor and quality of sake, consumers need to choose their bottles with care. To maintain the quality of sake, it is important to use appropriate production methods and to maintain suitable storage conditions.