Don't you just hate when Euron injures your pet dragons and perforates your fleet with a ballista?
Don't worry, all you need is a shipful of Wildfire and a very long fuse (or Mehdi Sadaghdar with electric equipment) onboard. Lay back, play some music and watch the ensuing light show.
But how does Wildfire even work?
What we know so far
Wildfire is a neon green liquid that's stable at room temperature, but is very easy to ignite with just about any spark or flame.
Wildfire, stored in a closed space, tends to cause enormous explosions, while out in the open, it simply burns with a green flame. Wildfire can't be extinguished with water and continues to burn for quite some time. It is also said that it can burn hot enough to melt steel beams.
Assuming no magic is involved, how could Wildfire work?