Like sodium thiosulfate, which acts as a sulfur donor on the endogenous rhodanese enzyme that detoxifies cyanide by converting it to thiocyanate POTASSIUM CYANIDE can be a basic salt in addition to a decreasing agent. Reacts with acids of all types to generate poisonous hydrogen cyanide fuel. Can respond violently https://what-is-potassium-cyanide37913.wikibriefing.com/2830577/indicators_on_potassium_cyanide_fisher_you_should_know