 Welcome back to Kids Fun Science. My name's Ken. Today's experiment is detecting counterfeit money in the United States. As always, adult supervision is required. What you need for this experiment is a $1, $5, $10, $20, $50 and $100 bill, a dark room and a black light. So you're gonna start off with this. I don't have a 50. I have a one, a five, a 10, a 20 and a 100, but I don't have a 50 on me. And these have to be newer bills. They can't be old bills. So go ahead and get whatever bills you can and then get yourself into a room that can be dark and you turn out the lights and a black light, as you can see. What's cool is when you hold it up, the $1 bill does not have anything on it. But when you get to the five, it's gonna have a blue strip that shows up in the black light. So that's pretty cool. So you can see that right there. You know right away it's not counterfeit. In the $10 bill, you're gonna see an orange strip or a yellowish strip. It looks like orange here to me. And they're in different locations in each one. And then the $20 bill has a nice green strip showing up with the fluorescent light. And then the $100 bill, this is a little lighter, but it has a pink strip right there. It's a little harder to see, but you can see it. And so that's how you can tell if it's counterfeit bill. So all new bills within the United States except the $1 bill have recently been redesigned. Each contains a thin, narrow plastic strip embedded within the bill itself, which is only visible when you hold it up to a black light. As that we've already seen, the strip of each type of bill will throw us a specific color in place underneath a black light. The $5 bill strip was blue as we saw. The $10 will be an orange. The $20 will contain a green. And a $50 bill will have a yellow or orange. And the $100 bill contains a pink strip. So these colors will vary somewhat under different wavelengths of light. It would be extremely difficult now to counterfeit these and place that strip within the counterfeit bill. I hope you enjoyed this video. Remember to click thumbs up and to subscribe. And thanks for watching.