I loaded up my watercolor palette with ultramarine blue and burnt sienna, knowing that when these pigments mix, they give a rich range of browns and grays.
I used two paintbrushes, for the ultramarine a 1/2 inch flat synthetic sable which gives lovely full washes, and for the burnt sienna a #1 round which gives fine detailed strokes.
What did I learn?
First, the little spaces I have been allowing myself are barely big enough to swirl large brushstrokes of color around the way I wanted to.
Next, the paints straight from the tubes can be blindingly bright contrasted to their near-complementary color.
Finally, I could have used several more sheets of paper today to keep experimenting with the way these two colors worked together.