Learning color mixing in watercolor

Yesterday my beginners had their first adventure with color. They've been practicing washes and brushstrokes, textures and values for three weeks using only Payne's Gray. It's just too confusing to try to figure out color when you haven't learned to handle a brush. Because they're all doing homework and seem to be "getting it," we worked on color theory and mixing a week earlier than usual. I demonstrate my split-primary color-mixing system, painting a color wheel with six colors, while I explain the principles that make it work. They all did a pretty good job of painting their own wheels following the demo. The usual problem is using too much water and weakening the saturation of the hues on the wheel. Their homework this week is to play with colors. It will be interesting to see what they bring in for show-and-tell next week.