 So now we're going to be comparing what this spectrum looks like, not just the plane spectrum but looking through color filters. So I've got an assistant here who's got some some filters and they are going to hold them one at a time down in front of the camera as I then take some video of what we're doing. So we're going to start with the red filter and when we put the red filter in you see what happens. Now we're going to switch it to the green filter and now the blue filter. These are our primary color filters. We have a few additional filters which you might be interested in seeing and so we're going to show you those ones now too. The first one is a color called cyan. The next one is called magenta and then the last one is yellow and that's what happens when you put a color filter in front of the diffraction grating blocking out some colors of light but not all of the colors of light.