We utilized our light table with this fun color activity.
Using jars of red and blue water and droppers the children made purple.
Too much red and it starts turning dark pink, and too much blue the purple disappears. It was cool to watch the kids figure out how much of each color they needed to get purple.
As an extension the children dropped blue and red on paper towels.
It was awesome to watch the water "absorb" into the paper towel.
They were so pretty on our light table.