Hey, I've been thinking..
Could you add sulfur, and Chlorine? (You can mix it with water to make CWATR)
You could add sulfur to the explosives genre, becuase it's made for plasticizer on certain bombs.
Read https://powdertoy.co.uk/Discussions/Thread/View.html?Thread=18901 please
Especially read point #3
Add in as many details and uses as you can. A boring element with not many uses will probably be ignored. If you give lots of uses, more people will like it want it to be added. Don't just add in random uses though, they should all have a purpose.