It is sometimes called "Fulminating powder". The mixture burns three times quicker than common black powder. The compounds are sometimes molten together, which appears to be a very dangerous operation.
rec.pyrotechnics, post by The Silent Observer <firstname.lastname@example.org. It comes from a text of 'Samuel Guthrie' written in 1831. More about this mixture can be found in Davis, page 30 and 31.