The person could also breathe extremely quickly and have either an incredibly rapid or incredibly gradual heartbeat. Sometimes the person's breath can scent like bitter almonds, even though this can be challenging to detect. It's a crystalline salt that has no colour and is highly toxic and soluble in water. https://is-potassium-cyanide-pois25802.onzeblog.com/29619521/potassium-cyanide-nfpa-for-dummies