Yesterday I tried the ink resist lesson from Val's online course.
First, the pencil sketch, then white gouache applied everywhere except the areas where black is required. Let it dry for the day. Black ink was then brushed over the entire board and it was left to dry overnight. This morning the garden hose jetted all the unwanted under layer of gouache away leaving the ink behind.
It is now drip-drying in the sink.
I'm quite pleased with my first attempt!
Lots to refine, but . . . a neat thing to do.