313c implies that While not detailed by name and CAS number, this chemical is reportable beneath one or more of the EPCRA section 313 chemical classes. 1st found out in 1786 by Scheele, who extracted it from the dye Prussian blue – and immediately died from exposure to the vapours https://what-is-potassium-cyanide91357.arwebo.com/52773750/everything-about-potassium-cyanide-class