In the video, a person is seen holding a glass of water and then pouring it into a measuring cup. The person then adds a drop of food coloring to the water, which causes the water to change color. The person then stirs the water with a spoon, and the color spreads throughout the water. The person then pours the colored water back into the glass, and the water in the glass changes color as well. The person continues to stir the water in the glass, and the color spreads evenly throughout the water. The video ends with the person holding the glass of colored water.