A recent Pottery Making Illustrated article inspired me to make some boxes. So, I rolled out some slabs of Soldate 30 clay that was available and tried the keystone form. The outside finish is a golden engobe with a black copper oxide wash. Inside is a satin black glaze. I did some others that have a volcano ash glaze on the outside; no pictures yet for posting. I had not done stiff slab boxes for a while; lost a few during the drying/bisque firing phase. But, that is what learning is about. I plan to make some of these with a low fire earthenware clay.