Assertion: blasting cap's charge | /r/HasProperty | a layer of primary explosive
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text: The cap itself is typically made of pencil stub-sized thin metal shell packed successively with a small lightly packed secondary explosive charge (typically < 1 gram) a layer of primary explosive (i.e. one that detonates on being heated) and a layer of match composition which can be readily ignited by an electric wire or the spit from a piece of black powder safety fuse.