When you are doing first aid instruction, it is best to demonstrate it as much as possible. Here is a way they showed us at a Pow Wow a few years ago. I did this with my previous Webelos den and they really enjoyed it.
Summer Activity. 1/4" Mt Dew in bottle, add tiny bit of baking soda and 3 capfuls of hydrogen peroxide. Shake and it glows. Pour on sidewalk to "paint"...Who knew!? (The kids will have a blast!!)" doing this this summer