Oleum is also known as fuming sulphuric acid or Nordhausen acid. It has a chemical formula of H2S2O7, and can be formed by dissolving excess sulphur trioxide[?] into sulphuric acid. See sulphuric acid for more information.
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... One of their agents was reputedly flamboyant Peter Churchill (no relation to Winston).
Secret Intelligence Service and Special Air Service also sent agents to France. ...