Rose Clay and Madder Root Powder Cold Process Soap

When The Nova Studio was having their studio sale, I wound up purchasing some clays and powders to color my cold process soaps.  I have been using ultramaries, etc. to color my soaps and I wanted to try clays and powders in my soap. I was really not sure how much to use so I was looking for any recipes that included clays or powders that use these ingredients.  I have not try using them yet, but I did find a cold process soap recipe from Lovin' Soap that uses rose clay and madder root.  The posting is called Rose Clay and Madder Root Powder Cold Process that looks really interesting.