You pay attention to the contents of the bottle label, there are labeled as "solid brewing" vinegar, and the unit price of 500ml more than 10 yuan price, there is no indication of acetic acid, sorbic acid, and so on the word, generally are natural brewing vinegar, brand you choose it.
Because remember: expensive is not good, but good is definitely not cheap!
The cost of brewing is stuck, so if it's less than ten dollars at retail, it's usually not absolutely natural.