This last picture is of a wax crayon layer covered with gouache paint. The surface is awaiting being scratched. But first I may add another wax crayon layer and then a further paint layer.
Then to scratch.
The ones above it are largely instinctive gestural mark-making using wax crayon. These crayons were designed for childish toddler-sized hands, so had a nice straight edge to them so they could easily be dragged across the surface of the cartridge paper pad. I shall consider whether to paint over them or leave them be.
Maureen Walker's Introduction to Printmaking Blog 