Why does the repair of the Confucian temple use pig blood?

After pig blood is processed, it is wrapped on the surface of wooden components with brick ash, hemp, cloth and other materials to form ash shells, which mainly play a role in protecting wooden components. Such exposed wooden components can not only avoid the erosion of wind and rain, but also shield the destruction of ultraviolet rays. Used for anti-corrosion, moisture-proof, insect-proof and other functions.

In order to make the color darker and luster better, add some fresh pig blood. After this pass, we are not afraid of wind and rain, nor of mud. It is most suitable for ancient buildings that are exposed all the year round.

This is why pig blood is needed to repair the Confucius Temple. As for customs, this record was not found. Above, I hope I can help you.