What does purple cool mean?

Purple is astringent and slightly cool, which means sour and slightly cool.

It means a little cold, which means that when the weather is a little cold, it means that the weather is getting colder gradually, and it will be a little cold in autumn, so you should pay attention to cold and warmth at this time to avoid catching cold and let yourself fall into a slight physical illness. So when the weather is cool, people should wear warm clothes in a warm room.