Manganese Heptoxide and Hypergolic Fireballs By FPSoutback in LivingPranks, Tricks, & Humor1,5078Introduction: Manganese Heptoxide and Hypergolic FireballsBy FPSoutbackFollowMore by the author: How to make and initiate the hypergolic reaction between manganese heptoxide Mn2O7 and various fuels by shooting the mixture. Slow motion spontaneous chemical ignition targets.