How to distinguish the quality of ceramic tea sets?

Distinguish the quality of ceramic tea set, can from the following four aspects to distinguish: Color: color sensory; shape: shape you have to love; General requirements for water outlet to cover mouth, a handle in the same horizontal line; sound: with lid in Hukou friction, sound more boring the better, the brittle that high metal content, the more boring that high mud content; air tightness: to the water in the kettle, press and hold the lid is small, but no water for air tightness good.