Potassium Permanganate : A comound with dark purple crystals (KMNO4) that are toxic if inhaled or ingested; it is a powerful oxidizer and may cause fire if in contact with organic materials. See: Permanganate of Potash
Ralph W. Burklin & Robert G. Purington, Fire Terms: A Guide to Their Meaning and Use, National Protection Association, Boston, MA 1980 USA. (Guide: Meaning and Use, Nat Prot Association Fr Srvc - Amer) {457}