Greek fire
The Greek fire recipes continued to be developed over the centuries, and by the High Middle Ages was much more sophisticated than the early versions. Saltpetre (also called "Chinese salt") was added to the mixture in the Islamic world, and China developed a dry saltpetre mixture in the 12th century, which eventually became gunpowder. Both the Parliamentarian and Royalist armies used Greek-fire-like petroleum-based incendiary devices known as "wildfire" during the British Civil Wars.