What do the different colors of Peking Opera masks represent and the characters in the Romance of the Three Kingdoms?

Black face means a straightforward and reckless character. For example, Zhang Fei in the Three Kingdoms drama is mainly black.

White face means treachery. For example, Cao Cao in the Three Kingdoms drama has a white face, and Sun Quan also has a white face. But white also represents age, so Huang Zhong also has a lot of white parts on his face. Pink face represents a loyal and brave person but he is old, such as Ding Feng.