A new method is described for measuring the turbidity of saké. We measured the turbidity of saké with the Pulfrich nephelometer. At the same time we measured the turbidity of BaSO
4 precipitation with the same apparatus under certain conditions and the relation between SO
4 ion concentration and turbidity is expressed as a curve. The turbidity of saké is expaessd as SO
4 ion concentration in turbid BaSO
4 solution. Turbidity of saké=SO
4mg/cc.×10
-4
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