Carr often used a very dark, almost black, line to outline the shadow side of some of the shapes in her paintings. Other artists use this technique, too. Some completely outline the shapes with black, as if in a cartoon, and then paint a shaded shape inside the outline to gives the illusion of depth. Degas sometimes used dark outlines in his pastel sketches–“Dancer Stretching”, for example.
I used the technique occasionally in this tenth painting. In the next version in this series, I’m going to experiment more with using consistently.