Yes, very true about what you guys state. But, it's common sense. Let's say that, well, you; the director; has two choices: Use real acid to make it look very real and repair it for stunts after wards OVER and OVER, or just try some props and some liquid, editing it with special efffects afterwards to create an illusion.
But a possibility of this is 50-50, because people can have crazy enough ideas, and some people want things to be 100-percent precise, doing everything slowly... But 100-precent right.
"To me, everyone is crazy. The ones in the Mental House just got caught."