 Welcome back to Kids Fun Science. My name is Ken. Today's experiment is fun with tonic water and a black light. As always adult supervision is required. What you need for this experiment is tonic water that has quinite in it, a clear cup, salt, and a black light. Some safety precautions before we start perform only under adult supervision. Do not stare at the black light as ultraviolet lights can be harmful to your eyes. Enjoy. To set up this experiment you just need a dark room, a little salt there, tonic water with quinite in it. Very important you have to have that. Make sure that's in there and a clear cup. And then you're going to turn off the light and the room and turn on the black light. And you're going to take your tonic water and add it into the cup. So let's go ahead and turn off the light and turn on the black light and we will pour it in. So here it is pretty cool. You know tonic water glows in the dark and I'll tell you the science behind this. Remember it is carbonated so it's almost spilled on me there. And go ahead and pour it and you get that cool poor look and you know it's really awesome. And so then we're going to do the experiment. So now what we're going to do is after we have that in we are going to put some salt inside the cup. And so we'll pour a little bit of salt. There's no exact measurement. Just put a little bit, wait a little bit, add a little bit more. And you will notice that the fluorescence of the tonic water is going away in the cup. And as you keep putting more salt in it will fizz too so you can't really see that right there. You see a little bit of a fizz and keep adding it in there and eventually it will not be fluorescent anymore. And I'll tell you the science why. So the science behind this is the tonic water contains quinine which was a requirement for this experiment. Which is highly fluorescent compound. The black light gives off ultraviolet light which is invisible to the human eye. The quinine has the ability to absorb ultraviolet light from the black light and convert it to a visible light. The substance that has this ability are termed fluorescent. The tonic water is especially beautiful under the black light while it's being poured as we witnessed. When the salt is added to the tonic water it clenches the fluorescence. The chloride ion in the salt reacts with the quinine molecule producing a product that is no longer fluorescent. I hope you enjoyed this video. Remember to click thumbs up and to subscribe. Thanks for watching.