If you want to change the colour of your shoes, pour some sulphuric acid on them. Your shoes will turn into utter useless mush, but you can transform a khaki canvas colour into a deep purple with only a few globs.
Outside of the colour change, it seems as if the shoe holds up valiantly against the acid. But in reality, the acid completely destroys it. The threading in the shoe dissolves in minutes, and the rest of the shoe basically falls apart on contact.