So the question was, what if I could apply the eco-print idea as an over dye. As a color changer. To make it useful to me. The answer is, I can. Below you can see the scrap after wash and dry. It is more orange of course, because the red over print has combined with the original color. They mixed. One seen through another. Success.
I soaked the scrap in soy milk mordant first. To guarantee a more intense color, because it was cotton. I am sure I can get a range of colors here, depending on what color and also fiber I start with. Maybe leaving it to set longer, maybe doing it more than once. With and without a protein soak. La la la.