pigments

Eugene Delacroix's painting can use crushed powder from mummies to paint the picture

Scientists at the University of Bonn in Germany examined the 66-million-year-old egg of the dinosaur feather called Heyuannia huangi and discovered the pigment in the green fossil.

A group of British and Chinese scientists claimed they had identified the true color of a dinosaur.

Some butterflies often carry symmetrical circular spots on their wings. It is thought that the eye spot terrifies the enemy by imitating the eyes of the enemy.

Unlike human hair and hair, birds' feathers do not turn salt or white when they get older.

In Europe the leaves in autumn are mostly yellow, while in the United States and East Asia the leaves are bright red. Why is there such a color difference?