How was the ancient red paper made? What dye is used?

It is recorded in detail in The Elements of Qi Min. The most primitive method of milling is to fill rice juice in a round bowl, make it precipitate, make it into white powder-greasy "powder English", and then expose it to the sun in Japan and China. The dried powder can be used for cosmetics. Because this method is simple, it is widely circulated among the people. Until the Tang and Song Dynasties, people still used this method to make rice noodles.

During the Wei, Jin, Southern and Northern Dynasties, Gong Ren Duan Qiaoxiao mixed rice flour, Hu powder and sunflower seed juice to synthesize "purple powder".

In the Tang dynasty, the palace made "butterfly-welcoming powder" from fine millet.

In the Song Dynasty, there was a kind of "Jade Girl peach blossom powder" made of gypsum, talc, mussel powder, wax fat, musk deer and motherwort.

In the Ming Dynasty, there were "pearl powder" extracted from white jasmine kernel and "Hosta powder" made of Hosta flower and Hu powder.

In the Qing dynasty, there were "pearl powder" made of pearls and "stone powder" made of fine stones such as talc.

= = = = Manufacturing technology = = = =:

Soak the good new rice in water for about ten days, and when the sour taste diffuses, take it out and grind it into a very fine powder slurry. Then pull Cheng aside. When the clean water is separated from the mud, pour out the clean water and throw it away. When the remaining water evaporates. Scrape off a rough layer of powder on the surface with bamboo chips, and the fine finished product will be below.