actual acids are pretty much all clear i think
actual acids are pretty much all clear i think
Water's not blue either. It's that way because how else are you supposed to convey what it is to the player? If it's clear they'll just think it's water.
i believe the concepts of 'acid' and 'radioactive waste' got combined in a lot of designer's minds into the single concept of 'toxic waste' which is green and glows and corrosive. i've also seen some games try to make 'acid' yellow, but i can't answer your inevitable follow-up "why would acid be yellow" with any actual answer beyond "feels right"
(edit oh, you answered this same thing in a followup post :) )