1, the manufacturing process is different: light soy sauce is mainly based on soybeans or black beans, flour as the main raw material, artificial access to the seed song, by natural dew, fermentation and become. Soy sauce is a thick-colored soy sauce made by adding caramel on the basis of light soy sauce through a special process.

2, the color is different: soy sauce is reddish-brown, while the old soy sauce is brown and shiny.

3, the use of different: soy sauce is generally used for flavoring, stir-fry and cold dishes used more. And the old soy sauce is generally used to color the food.