1. The quality of the vinegar is brownish red or brown (white vinegar is a colorless clear liquid), clarified, no suspended matter and sediment. The poor quality vinegar is dark or light, turbid, and deposits for a period of time.
2. High-quality vinegar with rich vinegar fragrance, poor quality vinegar taste is light; use chopsticks to simmer a little vinegar in the mouth, moderate acidity, slightly sweet, and not irritating into the throat is high-quality vinegar.
3 If the color of white vinegar is yellow or other colors, some yellowish white vinegar indicates that the nutritional value of the grain is higher than that of white vinegar containing glacial acetic acid.