313c signifies that although not stated by name and CAS number, this chemical is reportable below a number of from the EPCRA section 313 chemical groups. There are no reports that cyanide could potentially cause cancer in people today or animals. EPA has decided that cyanide is just not classifiable https://jaidenyvvql.livebloggs.com/35841185/cyanide-in-cassava-pdf-fundamentals-explained