"explosive"-

(a) means gunpowder, nitro-glycerin, dynamite, gun-cotton, blasting powders, fulminate of mercury or of other metals, coloured fires and every other substance, whether similar to those above-mentioned or not, used or manufactured with a view to produce a practical effect by explosion, or a pyrotechnic effect; and

(b) includes fog-signals, fireworks, fuses, rockets, percussion-caps, detonators, cartridges, ammunition of all descriptions, and every adaptation or preparation of an explosive as above-defined.