Priming Composition 2 : A mixture of materials that is sensitive to impact or percussion, and when exploded, under-goes rapid autocombustion; it is used to ignite primary high explosives, black powder, etc
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}