Hei Jin Gang Clay 黑金钢沙 is a blend of Zi Ni (Purple Clay) and Bao Lan Zhu Ni. It's dark in color with some purple and brown with a small amount of sand mixed in. Porous and perfect for seasoning with Pu-erhs or Oolongs. It's also good for Hei Cha (like Fu Brick, Tian Jian or Liu Bao).
