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war and explosive, piric acid if wet was misfiring under rainy humid condition, trinitrotoluene (TNT) give high armor penetrating ability, black smoke clouds was produced by gunpowder, propellant for projectiles ought to be quickly loadable, gun cotton had been used from the early1880's gun cotton mixed with nitroglycerin, nitroglycerin and dynamite was destructive for guns, world war I munition contained piric acid, armor penetrating ability helps to perforate thick armor plates, piric acid is a yellow solid synthesized in 1771, picrates are highly shock sensitive