I do this in my classroom too. The kids put it on their desk when they leave which lets me know who is gone and only let's one girl/boy out at a time. When they return they are reminded to use the sanitizer. The kids love it so have plenty of sanitizer on hand.
Color clothes pins by soaking in food coloring. In each jar or container, pour boiling water, a tablespoon of vinegar and food coloring drops and mix well. You can use any combination of drops to make varying colors and shades. I used both traditional food colors and the neon food colors to make about a dozen different colors. Add your clothespins and let them soak for at least an hour.
I used this touch light during small reading groups, when the light is on students cannot approach me or interrupt. When the light is off they can ask questions which is usually when I transition between groups. My kids loved it and it was only $1 at the dollar tree!