I had originally bought some black cotton rag, intending to make a large batch of grey cotton printmkaing paper, similar in color to rives BFK grey. However, I added just a tiny bit of black to the beater, and you can see how it turned the whole batch deep charcoal grey. So I decided to make a variety of shades of grey, by slowing adding more white.
Voila! 15 Shades of grey paper pack. This limited edition paper sold out right away!