Sodium nitrite is a nitrous acid salt. It has antibacterial and antioxidant properties, therefore it is used in food production as a preservative and, incidentally, as a color fixative. Sodium nitrite is usually listed on labels as an E250 food additive. You can meet it in the composition of boiled, uncooked smoked, salted-smoked and dried meat products (sausages, sausages, etc.), as well as canned meat.