Watch this simple guide to How to Use a Color Wheel above! A color wheel can be a super useful tool when you're just starting out and learning how to mix colors and color relationships. When I was in school, it was highly recommended but not mandatory to get one. So, Do you need to buy a color wheel? I think it depends. If you're feel pretty comfortable with color relationships and know the general idea of mixing colors, then you're probably fine. If you're struggling with what colors to mix to get a purple, then a color wheel can be pretty helpful. That being said, the color wheel isn't the full proof way to mix that very specific, perfect shade you've had in mind. The color wheel can only show you the combination two colors, and really it's one of the pure colors and one with either a primary color, or black and white. And at a specific ratio. So it's not a perfect tool, but it's a great way to learn.