The vinegar sold on the market, which has more ingredients, may have been deteriorated beyond the shelf life, but because of the taste of vinegar itself is acidic, even if it has been deteriorated, it is difficult for ordinary people to distinguish, so it is recommended that expired vinegar do not eat, its safety has not been guaranteed.

Expired vinegar processing methods: 1, remove limescale: vinegar has acetic acid, can dissolve the limescale in the thermos cup or kettle. Put the expired vinegar and hot water into the cup, cover the lid and shake it, leave it for 20 minutes, the scale can be removed.2, clean metal: copper, aluminum ware with old, with expired vinegar coated with rubbing after cleaning, you can restore the luster.