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  • E252, or potassium nitrate, is a chemical compound with the formula KNO3. It is a naturally occurring mineral that has been used for centuries in various applications, including agriculture and food preservation. In the food industry, potassium nitrate serves primarily as a preservative and color fixative, particularly in processed meats.


  • The effectiveness of cyanide in extracting gold is attributable to its ability to form stable complexes with gold ions. This allows even minute quantities of gold to be extracted from ore, which would otherwise remain unaccounted for. The resulting solution is then treated with zinc dust or activated carbon, which displaces the gold from the cyanide solution, allowing for its collection and purification.