Through bio-engineering, and technological advancements, we have been able to create ShadowFluid. ShadowFluid is a type of FeroFluid that spreads like a shadow. If there was a light source at the top of your face, the ShadowFluid would remain at the bottom of your face. It doesn't like the light, so it moves towards darker areas, thats why you'd see it in more dimly lit places rather than just anywhere. We have ran multiple tests using it, and they have been a success! Making lives better since [REDACTED]!