PROBLEM TO BE SOLVED: To inexpensively make Sake of individually favorite tastes by brewing the specially treated rice malt (Koji). SOLUTION: In the brewing of Sake wine using steamed rice and rice malt (Koji) as raw materials, the rice malt is treated with the alkaline or acidic water prepared by the diaphragm electrolysis of water and the treated malt is used for brewing to give Sake of light and refreshing quality or of high body quality.
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