People with low vision need high contrast images more than those of us who can see subtle value shifts. Ideally, this "wax resist" assignment would be done starting with only white crayon, or white oil pastel, but we also have liquid wax that is used for ceramics to block glaze from the bottoms of cups and bowls. There is dye in this wax to make it easier to see for those who need the some contrast to start with. So my students drew and painted with waxy or oily medium, and then brushed ink on top. The ink only stuck to the paper (although we did have to dab the tops of the oil pastel with a paper towel, to be able to see it better), to create a black and white (or black and green) image, with enough value contrast for my low vision students.
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