Recently, sake has come to be frequently sold in transparent refrigerators fluorescently lighted. In such cases, the sake is sometimes colored highly. This seems due to the effect of fluorescent light. We researched the effects of fluorescent light sake coloring. As for the relations between sake coloring and the six types of fluorescent lights, a three band fluorescent light (natural white) colored sake most highly, second was a fluorescent light (natural white), and a high color rendering fluorescent light coated with UV absorption film (natural white) colored sake least. We researched the effects of four color-films on sake coloring. A red film was most effective for preventing sake coloring. A blue film was least effective in preventing sake coloring. As a result of a multivariate analysis, light with a wavelength under 450 nm produced an effect on sake coloring.