 Okay so here we have Ultramarine blue and a Thale blue with a green bias and so just to give you a quick indication of their biases we'll do as we've done before and just add a little bit of white. So now you can instantly see because this has got a green bias to it if we mix it with the red and this undertone of green will act as the reds complement and as we've learned that complementary colors mute each other out so if we have the red and this blue we're not going to be able to get a really really bright purple because the complementary colors of the green and the red will neutralize each other. So you can see the big difference here in how bright this one is in comparison to the other blue. So as you can see a red based blue mixed with the blue based pink or blue based red that always going to mix the brightest purple. So the keep three points to remember are one which red you're using, two which blue you're using and three how much white you're using because this can alter the shoe of your color. So you can start to see how terrible this is to make a purple like it's really a really kind of nasty color no way in comparison to this real nice brightness that we've got over here. So now let's have a look to see if you went even further the wrong way and we're using the Sartthalo blue with the green bias with the cad red. So still red bright red still a blue we know this can get a really bright blue but it doesn't make purple when we mix them together in fact it's very very close to a gray. So the other way to have a bright purple is a bright premixed purple this is cobalt violet you can start to see when you look into the labeling what is made of. So it's got quinacridone which is this color here we've got a zinc white and a dioxine purple as well. So you can see already it's a lot closer as you're trying to make a clean purple. So this is just with the white you can see how it's slightly slightly more vibrant than this one but you know not really it's very very close I mean you've got a slight more punch but this is very very close okay this is Wilkham from Wilkham Art School if you click on the link below you can learn more about acrylic painting at my website.