Quote Originally Posted by Oromin View Post
I always just figured it was because most acids look like water. If it's a bright color then people know it's supposed to be something else. Green being a distinctly unnatural color is probably an upside.
Hey! Green is as natural a colour as it gets.

(I'd be surprised if anyone else in this thread knows what Marble's reagent is)
Isn't it just watered-up hydrocloric acid with some copper salt tossed in?