One such text is Huangdi Neijing (The Yellow Emperor's Inner Canon) which offers insight into Daoist thought and traditional medicine. There are many secrets of tea hidden within this book. One important lesson that can be inferred is how the colour of tea can be used to harmonize yourself with seasonal change.
The theory of Five Transformations (Five Movements, Five Phases, Five Elements, Wu Xing) is thought to have originated before recorded Chinese history. The theory pairs the five traditional Chinese seasons- Spring, Summer, Late Summer (or two weeks before and after Equinoxes and Solstices), Autumn, and Winter with five colours green, red, yellow, white, black (colour is only one of many different pairings). The pairings are as follows:
Late Summer (or two weeks before and after Equinoxes and Solstices)- yellow
Huangdi Neijing states that we should consume food of a certain colour during its paired season to optimize our health and harmonize our bodies and mind to the seasons. One feels that these colour-season pairings also apply loosely to tea.