This step tablet test is about as good as it's going to get. There is the slightest whisper of tone in the 0% patches on top, next to the strip masked by the Rubylith (I don't want 'full paper white'). If you look at the strip on the far right side the separation between the dark patches and the surround disappears at the 99% level. Close enough. The gang test beneath wasn't given enough exposure. You can see the edge of the negative material. Problem now is that the paper I ordered on Tuesday still isn't here, I can only make a few more prints before the new stuff arrives.