Synthetic vinegar, also known as vinaigrette, is diluted with edible glacial acetic acid. Its vinegar flavor is big and acidity is big, but no fragrance. Glacial acetic acid has a certain corrosive effect on the human body, and should be diluted when used, and it is generally stipulated that the content of glacial acetic acid should not be more than 3 -4%. This kind of vinegar does not contain all kinds of nutrients in vinegar, so it is not easy to mold and deteriorate; but because there is no nutritional effect, only flavoring, so if there is no special need to refer to the prescription use, or to eat vinegar as well.