As Noctro also wrote, there should be a way to control the timing for those effects. But I don't think they aren't DNDish. I mean... well... fire+water=nomore water
Poison and Fire are quite common in Dnd, I had players quite used to throw flasks of burning oil.
My problem with the effects is, f.ex: electricity, it should electrify the liquid the moment it touches it and then disappear, not make the liquid stay electrified, also, apart from saying how much time it has to stay there should be a tick for making some effect permanent (Ex. a thick brown-greenish fog in a tomb that MAYBE is poisonous, or maybe does nothing but the players will get paranoid) which leaves to the last point: making new paintable effects of that kind, I know that making brand new ones won't be that easy but...Why we can't change the color/properties of the ones we got by default?
