This is a web cite that has science demonstrations for elementary students. The demonstrations are very detailed but broken down into easy to follow steps. In particular this shows that in sunlight there are several components, some of which can be harmful even though they cannot be seen or felt. The students are to blow bubbles onto a black piece of plastic and observe the colored fringes on the bubble. Note that the colors seen on the bubble are the reflection of white light shining on the bubble film.
White light has many colors, each color having a different wavelength.
This experiment also shows the concepts of constructive interference and destructive interference. It is a fun demonstration that has a good way to describe the concept of inference. Fairly easy, but gets the point across. Using holograms to help understand the concepts of reflection, constructive interference and destructive interference. By describing the process of producing a hologram, we understand how light is used.