from wikipedia Mn2O7 arises as a dark green oil by the addition of concentrated H2SO4 to KMnO4. The reaction initially produces permanganic acid, HMnO4 (structurally, HOMnO3), which is dehydrated by sulfuric acid to form its anhydride, Mn2O7.
2 KMnO4 +(cold) 2 H2SO4 → Mn2O7 + H2O + 2 KHSO4
Mn2O7 is a volatile liquid highly reactive being a powerful oxidiser. It is able to oxidise (burn), no sparks needed, any sort of organic matter...sugar, hydrocarbons, paper, and even a potao chip!!!....
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