Red, green, and blue food dyes were dissolved into a thin film of bike chain lubricant and pressed between two acrylic plates. In the video (automatically converted to a Short due to its aspect ratio), the front plate is being pulled away, creating a pressure which causes air to displace the dye/lubricant mixtures. The experiment was conducted with the plates oriented vertically, such that gravity acted parallel to the plate surfaces (downwards in the video).