Introduction A black film can makes an excellent container for a soap film. The colors of a soap film are bright against the black background of the can. Remove the lid from the film can. Place the white paper on a table top. Pull it out.
Film can with soap film over opening Hold the film can over the white paper in a brightly lit place.
Hold the film can so that the soap film is in a vertical plane. Watch the colors form and move in the film. Notice the horizontal bands of color. Notice that after a while the top of the film becomes invisible. If you poke a pencil point into the invisible region of the film it will break.