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What Callinicus (if we believe the attribution) likely invented in the 670s was not the substance, but the flamethrower-type mechanism for projecting it. Theophanes says it was projected via a siphon, i.e. a pump of some kind.
From the illustration above, we can see that it was then forced through a kind of brass nozzle or tube, and thrown at enemy ships. The innovation was therefore this crude flamethrower device, which involved some heated chamber full of oil ...
... which could then be pumped full of air. A valve would then release the fluid through the tube; at some point it would be ignited and the entire plume would catch fire. Schematic:pic.twitter.com/ETaER5h1OS
Alternatively, I guess, you could just cover your enemy in unignited oil and then fire flaming arrows at him. Although this entire process seems highly dangerous, not a single accident is reported anywhere in the sources.
This mostly from J. Haldon/ and M. Byrne, "A Possible Solution to the Problem of Greek Fire," Byzantinische Zeitschrift 70 (1977), pp. 91–99.
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