Colour with soy sauce. Light soy sauce is suitable for cooking or pickling vegetables, fish and meat, while deep soy sauce is suitable for coloring dishes. Soy sauce is made from soybeans or defatted soybeans or black beans, wheat or flour as the main raw materials, artificially inoculated with distiller's yeast and naturally exposed to the sun for fermentation. It is light in color and reddish brown. Soy sauce is used for general cooking, and soy sauce is mainly used for seasoning. The color is lighter, so it is used more when making ordinary stir-fried dishes or cold dishes. Using high-quality soybeans and/or black beans and wheat or flour as raw materials, and extracting after fermentation.