A microkernel implements all drivers as user-space programs, and implements core features like IPC in the kernel itself. A monolithic kernel, however, implements the drivers as a part of the kernel...
Porcelain is made with kaolin clay. Kaolin is white clay that retains its white color when fired. It is fired at temperatures in excess of 1300 C and is more fully vitrified than stoneware. It is usually covered with a clear glaze, which allows the white body to show.
These numbers can oftentimes help to identify the manufacturer and date. To tell the difference between porcelain and pottery (aside from the translucency test) run your finger over the unglazed footrim or bottom of the item, if it is porcelain it should have a glassy feel and be white in color.