Duanni clay is an umbrella term for a particular type of clay from Yixing. After firing, this clay has a light or yellow-toned color.
Finding the best clay for sheng pu-erh is something that can be challenging for people who are new to pu-erh tea. This article discusses the different options.
Experimenting in Gong Fu Cha is a way to get better tea. I bought a teapot for a particular tea but saw it’s much better to brew a different tea.