I unloaded the soda kiln today with much disappointment. I had hoped for rich browns, dripping, and flashing and instead got a lot of grey ware. This is the most successful piece and the largest at 24" +\-. The kiln has the last word but I'll be back for more. The reddish brown is from a Redart slip (earthenware clay) brushed on before firing. I'll have to dip some cups in that for the next firing.