I believe that the "Broquet " product was based 0n the idea of the WW2 aircraft fuel cell.
Lead and another metal ,[ not quite sure what ] have an electrolytic reaction when a fluid conductor , [ petrol ] comes between them . [ Something like a lead acid battery ].
This causes fine lead fragments to mix in with the petrol , and therefore raises the octane rating by a fair bit .
Can,t remember all of the tech details , but it did work .
So it is quite possible that the idea has been used for various other applications .
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