Preservative, mineral, or synthetic, used in meat-based products.

Sodium nitrate is used as a food additive (preservative) in certain meats (poultry or charcuterie). It should not be confused with sodium nitrite, also used for meat preservation, which bears the number E251.

In diluted solution, potassium permanganate is used for water treatment. It also serves as a disinfectant at a concentration of 0.5 grams per liter, commonly employed for washing vegetables in tropical countries.