For coloring the talus I dabbed different colors of paint on the talus with a brush. The order of the paints that I used is: Folk Art Clay Bisque, Folk Art Burnt Umber, Folk Art Raw Umber, and Folk Art Amish Blue. I did this process twice in the same order. After the paint was dry I went over it with a Raw Umber Wash (5 part bbwsf:1 part paint).
I am not totally thrilled with the color. I feel it is darker than I wanted but talus stains differently than plaster of Paris or hydrocal. I think I am going to hit them again with at least one lighter color was mostly likely Raw Sienna and maybe a light gray wash. The last was will be a Black wash which will bring out the cracks and crevices in the talus.