Vinegar authenticity of the identification: the color of real vinegar is brown or reddish brown purple or colorless and transparent, shiny, incense, sour, soft, slightly sweet, not astringent, long aftertaste, the appropriate concentration. Fake vinegar is made of industrial acetic acid mixed with water. The color is light, the hair is black, the bottle is sour, and it has no fragrance. The taste is thin. Except for sourness, it has a bitter taste and a suspended substance.