Teach your kids how to do the tests and let them see the color changes and count the drops. It's educational (simple math and science skills) and it's fun; heck, get them a pair of kid's safety goggles and some small sized disposable nitrile gloves and they'll have a blast. I find telling kids not to touch something only makes them more curious to play with the very thing I have told them not to do (typical kids). So it's better to teach them how to use the stuff and to be careful with it and then they're less likely to mess with it. Plus, the mystique wears off pretty quickly after the first few go-arounds and so they'll likely never want to bother with them again.Are there ever any kids over at your house? I would be concerned with the reagents being too accessible. Mine are out of reach.