Hi there Beverly,
I really like science and doing hands on activities. I think you might like an activity about chromatography. You can have the students learn about how all the colors make up the color black. By using easy to find materials like a coffee filters, a marker, a transparent plastic cup, and water, the students can see how the colors separate. Then you can introduce them to concepts of chemistry. Since chromatography is what scientists use to solve mysteries and figure out evidence, you can somehow incorporate this and make a game out of it. Here is a link that found on Youtube..
You might be able to find some articles related to this chromatography on this website.
I hope you enjoy this activity, it's super fun!!