One of the first assignment that Sian has you do is create a color wheel. Although she asks to work them with gouache, I could not find my set (I don't use them often), so instead I used my Golden Fluid Acrylics. There is some streaking, but I think it is okay.
We used two different base hues of the primaries to create the wheel. I don't know if I liked it as much, or if it made it harder to get the colors to flow from one to the next. I think that I would have prefered to create several different wheels using the cooler primaries and then one using the warmer primaries. To me the hardest color to duplicate was the turquoise. I had to create several swatches before I felt it was right.
Another thing to think about is how much black is added. The point really wasn't to make a dark color but really to mute the brightness of the pure hue.