RFNA is a rocket fuel (a storeable oxidiser): red fuming nitric acid. HNO3 + 13% N2O4 and 3% H20. The colour of the resulting red fuming nitric acid is imparted by N204.
... in early Grand Prix racing, winning the first ever Monaco Grand Prix and with driver Jean-Pierre Wimille[?] they won the 1937 and 1939 24 hours of Le Mans.
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