It's easy to make, but hard to make a lot of. I've dumped approx 75000 parts of dust on it, only 3 256 px rows of it so far. Get this - it's lighter than dust!
for less than a single frame, if acid goes to 50 life then immediately eats something else, it will go to 49 and live. I'm pretty sure this feature is intended, as there is color code for it.