Suppose you take an ice cube tray and use petroleum/gasoline to freeze some blocks of it. What would happen if you:
a) placed a cube above naked flame; or
b) threw a cube against a surface which caused a spark?
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Nothing. It wouldn't actually be frozen per se, just turn into a gel. If you heated it up then it would be the equivalent of melting wax, which itself won't catch fire until it is in free flowing liquid form.