For the effects in Compressed 03, I was drawn to the dynamic interactions between liquids. I spent about a month playing mad scientist to see what gave the most interesting results. I raided the kitchen for common stuff like milk, oil, and molasses. I stopped at the drug store and buy random things such as witch hazel, nail polish, and bubble blowing mix. I ordered exotic stuff like ferrofluid online. Some liquids repelled each other, some caused coagulation, and some created intricate patterns.
I settled on ferrofluid as my primary liquid, since it yielded some nice interactions with other liquids and could be manipulated using magnetism. All of the black or brown seen in the film is ferrofluid.