Is the color of the red building in Tianyu kiln different?

After consulting Wen Jinhui, the main component of Ji Hong is copper oxide, which, like the red colorant in glaze, is also particularly sensitive to the mild atmosphere in the kiln, and it is prone to the phenomenon of different shades. It will be different before and after the kiln is red.

Ji Hong was made in Xuande Kiln in Ming Dynasty. Also known as Red Sacrifice and International Red. It also refers to porcelain of this color.