After picking tea leaves, families first sorted out the damaged or rotten leaves then began the sunning process. This process inhibited water evaporation within tea leaves to promote oxidation. Over-oxidation can alter the taste of the tea to become "grass-like" or thick and bitter, so farmers heated the leaves to stop the oxidation once the desired level was reached- a process known as 'firing'. Then, leaf cells were broken down by gently rubbing the tea leaves- this process helped volatilize the scents and tastes when brewing. Tea leaves were damped then rolled into shapes, making its storage convenient while also allowing sap to squeeze out and provide additional flavoring.