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Nitro-9 was an explosive created by Ace in school, where she blew up the science building with it. Ace mixes it herself and puts it inside deodorant cans.
Nitro-9 is a variant of Nitroglycerin and a variant of Nitro-9 is Nitro-9a, which was half the size and half as powerful. (NA: Timewyrm: Exodus)
Though the Doctor has told her not to carry it, she continues to and has used it to destroy a Cyberman shuttle,(DW:Silver Nemesis), and to open the entry for King Arthur's spaceship.(DW:Battlefield)