 So here we've got ultramarine blue and cadmium orange so I can show you a quick example of complementary colours and how they mix together. So with two complementary colours, when you have them both next to each other so if we had a bit of this blue directly next to some of the orange you see that what happens is there's like a vibration that happens on your eye it doesn't really sit necessarily well together when you have a very bright orange and a very bright blue but what they can be used for to start to create mixtures between the two to tone each other down. Here you can see a tonal range and how by using a colours complement you can get a muted version of that colour. You can tone down orange with black as well it would just slightly deaden the colour a bit more than if you used its complement. So here you can easily see how effective as in a colours complement is to tone it down both easily and to still get a nice colour. If you want to learn more about complementary colours and acrylic painting click on the link below and have a look at my website.