What pigments are used for red pillars of ancient buildings?

Earth-red pigments are used for red columns of ancient buildings. This kind of pigment mineral pigment is antique in color, resistant to atmospheric invasion and has the best color retention. The disadvantage is that the color is not bright.

The red pillars of ancient buildings are also made of cinnabar pigment, which is called "China Red" and made in China. It is bright and warm. This pigment has good color retention, but its disadvantage is that it contains poison. So it is not widely used.