Thx a lot :) I am glad that you like the effect. Actually it is Vallejo Dark Red Ochre Pigments. After modelling the base I gaved it a semi dry cover of the pigments followed by a layer of Anti-Shine varnish (To help fixing them). For the last layer I applied the pigments with a drybrush without any water at all.
Burnt Sienna Pigments from Vallejo gives a good similiar effect too but its is a bit more brownish and didn´t worked all too well as a contrast on the Minis. It is great Deathwing Termis instead!
Being from AZ, I give you extra points for the Sedona red rock basing! I've found that the color is great to contrast the blues and greens and purples of Tzeentch.