Non-toxic ground

The 18x24" black plate has been etched after drawing into it over soft ground. Today I went in and did drypoint work (etching directly into the metal with a needle). I also applied a layer of hard ground, mixing Future floor wax and water-based ink directly on the plate with a foam brush. Needs to harden for 30-60 minutes, then can be drawn into. I tried this ground once before as an alternative to the traditional asphaltum (petroleum-derived), beeswax, and solvent-based hard ground.