First test tiles are out!
Not so good but learned a lot. So much for subtle color.... the color is a screaming. Worked on next batch of tiles which I have used a plastic rib, a metal brush, a brillo pad and fine steel wool with a final wiping with the sponge to remove the color.
Today is Friday, I won't see the results till Monday evening. So in the meantime will pull out the acrylic paints to play with color combinations.