A lot depends on what 'Greek Fire' actually was...
Lost the reference but, IIRC, there were several versions-- Think flame-thrower vs 'WillyPete' vs incendiary bombs. Snag was their recipes were held so secret, the various stages of their disparate processes were apparently lost during serial Byzantine upheavals...
I suppose the modern analogy would be 'FogBank', the near-mythical stuff acting as spacer in US' Cold War H-bombs. It was 'beyond top secret', with added security due obscurity. To the point, apparently, that the documented recipe *didn't work right* when later retrieved from the vaults. IIRC, the US had to spend a LOT of money re-inventing that toxic aerogel...
Um, unlike nukes, some counter-measures had been developed for some aspects of 'Greek Fire'. Still...