1, look at the packaging: when choosing soy sauce, look at whether there is QS mark on the packaging of soy sauce, which is the access mark for soy sauce to enter the market; Let's see if soy sauce is brewed or blended. If soy sauce is not marked with brewing or blending, it is an unqualified product. 2, look at the color: pour the soy sauce into the white porcelain plate and shake the color. Soy sauce is reddish brown, while soy sauce is brown and shiny. Taste soy sauce, eat soy sauce and taste salty; Soy sauce has a delicious sweetness when eaten in the mouth. 3, look at the wall hanging: after shaking the soy sauce bottle, the brewed soy sauce has good wall hanging performance, stays on the inner wall of the soy sauce bottle for a long time, and the inner wall is easy to change color; The prepared soy sauce has poor wall hanging property and poor coloring power. 4, look at the foam: the brewed soy sauce foam size is relatively uniform, not easy to disperse; The prepared soybean foams have different sizes and are easy to disperse. Dongshi