This dropped into my e-mail this morning and it looks very interesting. Between a heavy workload and moving I think this one will have to wait a few weeks but its definitely interesting.
This reminds me of a watercolor technique my mother taught me. You brush plain water onto the paper in any shape or stroke and then touch a well wet brush loaded with color to the water spot and it sucks up the color in very interesting ways. It also does not go beyond the water threshold unless it drips. Very interesting and organic color blends can be created this way. I believe it is called “wet on wet” technique.