 Welcome back to Kids Fun Science. My name is Ken. Today's experiment is Newton's Diss, the Reverse Rainbow. As always, adult supervision is required. What you need for this experiment is Sharpies, a red, purple, blue, green, yellow, and orange, a glue stick, a pen, scissors, a piece of paper, a CD, a couple skewers, cardboard that is bigger than the CD, and some string. To set up this experiment, you take your CD and you're going to mark out a piece of paper around the CD and in the middle there. The middle is going to help you get a center point of where you need to make the sections. So basically you're just going to make an X and then from there you're going to draw a line right down the middle. You're going to have to be exact. There's your six sections. Then you're going to take your colors and you're going to go to the exact order like this, red, violet, and then blue. I believe it's green and yellow and orange. I do the same thing with crayons to give a little lighter effect and you'll see the two different examples with the Sharpie and the crayons. So I'm not going to show you the crayons, the Boria. Then you're going to cut it out right on the line to see your cutting skills. Do the same exact thing with the cardboard here. You're going to cut it out. You do not need to do the middle here. Then you're going to take your glue stick, glue the cardboard, and then you're going to place on both sides. I did the Sharpie on one side and I'm going to do the crayon on the other side. From there you're going to take either a skewer or you're going to take toothpicks. I just use toothpicks and you're going to go on the outside of the circle on one of the lines here, the straight line right there. You're just going to poke a hole all the way through. Be careful when poking through. It should be pretty easy to go right through. Wiggle it around so there's enough room for the string to go in. So you want it a little bit bigger. It doesn't have to be huge, but big enough for the string so it's not tight. Then you're going to take 36 inches of string or 91 centimeters. So that's a 12 inches right here. I'm going to do that three times and then we're going to cut it. From there then we're going to lace it through the disc. So now we're going to lace it through both sides. I should have had the crayon on this side so I had them on both sides, which I do correct. Then lace it straight through on this side again and then you're going to get the ends to come even. Once you've got them even then you're going to tie a little knot at the end. Just loop it around once. It doesn't have to be a double knot or anything. Keep it as close as possible. Then you're going to grab both ends and center the cardboard, the disc in the middle, and you're ready to do your experiment. So now you're going to spin the disc around with both hands or one hand. You just got to spin it around until it gets super tight. You'll feel the string tightening it up. Then you pull out, let it finish spinning, and then pull back in. I'm going to wind it up a little bit more and then you pull out. Let it wind up, pull in, release, and it will go faster and faster. You'll see with the darker colors on the Sharpie, it almost goes to a white, reversed rainbow here with Newton's disc. It doesn't quite. You've got a little bit of a pinkish color in there as I'm seeing. As it goes, the fastest it goes is when you're going to see that. So when we switch over here, I'm going to go to the lighter crayon colors that I have on the other side. Wind it up, get it going, and then pull out and get it going. Once you get it going, you can see here it actually almost blends into the white light. You almost see completely white there as it goes super fast. That's awesome. So again, a reverse rainbow there by spinning it the faster you go. And you can see my hands on pulling out. Let it relax and then pull in. Keep going back and forth and you can see it gets to that white color right there. So the signs behind this will show you how the colors in Newton's disc blend together and they are merged to blend through the white light to our brains in our eyes. The Newton disc is a well-known physics experiment and was invented by Isaac Newton. My disc has six segments of the rainbow colors. When the disc is rotated really fast as you see here in the video, the colors will fade to white. This is what Isaac Newton demonstrated that white light is a combination of the different colors bound in the rainbow, hence the name reverse rainbow. I created Newton's disc with six different colors, but you can do the combination with just red, green, and blue in the circular disc to yield the same results. This is due to the phenomenon called persistence of vision. It's in a very important discovery that proves that light is not colorless, but it has color in it together that converges to give the faded white color which we consider colorless. This experiment was the final proof that white light is made up of all colors in the visible spectrum. Kids friends hat? Yeah, we have videos right over here.