It is a extremely poisonous compound and when ingested or absorbed through open wounds within the skin it is incredibly poisonous. When it can be heated to decompose it provides out fumes which might be poisonous. Health effects/safety hazards: Potassium cyanide is highly toxic along with a potent poison, https://potassium-cyanide-cas-no49370.ampedpages.com/the-fact-about-potassium-cyanide-acid-or-base-that-no-one-is-suggesting-61664202