I have sure you heard about the purple acid but you haven't seen the light pink acid. You make it by burning the normal acid and pausing it in pressure display and zoom into the acid. This maybe the fire making it glow through.
It is the fire... Erase the fire right around it, and it becomes regular. The life is the same as regular. It is just the glow of the fire on top of it.
yes simon removed the purple acid, but also fixed the gradient for acid so that it now gets darker with less life as it was supposed to(but was broken somehow and you could see the result as with purple acid).