A new trailer for the Suicide Squad movie is out, and shows a quick glimpse of a scene where Margot Robbie gets pulled out of a vat of chemicals (thin slime).
We'll have to wait for the full movie to see how the scene plays out (length, aftermath, etc). But thought it would interest some of you.
It's not slime it's acid. The colors around Joker is the dye from his clothing getting dissolved. It's probably going to be their designated origin story for Harley Quinn (Margot Robbie). Joker throws her into the vat of chemicals that he fell in to make her as crazy as him. That's what causes her pale-grey skin and de-saturated hair.