Blue Bubbles You will need: throwaway cups, Equal amounts of liquid dish soap and water, blue food coloring or blue paint, Straw (cut small slit in it to prevent sucking up into the mouth but allowing bubbles to come out the bottom). Mix up bubble solution in each cup. Add blue food coloring. Blow bubbles into cup until almost overflowing. Take white paper and lay in the bubbles. When they pop on the paper, it leaves pretty blue circles.