Sodium cyanide, commonly known as the rhizoma kaempferiae, is one of the types of cyanide, is white crystalline powder or large pieces of solid, is extremely toxic, chemical formula for NaCN. It with the bitter almond smell, moisture absorption can sniff out related to the individual genes. Sodium cyanide hydrolysis strongly generate hydrogen cyanide, a strong alkaline solution. Often used to extract gold, silver and other precious metals, also used in electroplating