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fulminic acid[fu̇l′min·ik ′as·əd]
, an isomer of cyanic acid (HO—C≡N) and isocyanic acid (HN=C=O). It may be regarded formally as the oxime of carbon monoxide; therefore, it is also called carbyloxime. Fulminic acid is formed when its salts (fulminates) are treated with acids. It exists only in solution; its smell resembles that of prussic acid, and it is just as toxic. Its most important salt is mercury fulminate, a detonating powder. Other salts of fulminic acid are also extremely explosive.