How to distinguish pure yang from pure yin

Kunzao: Wuwu Year, Geng, Bing Yinri, Reform Movement of 1898. There is no doubt that Tiangan, Geng and C are all Yang. Some people say that noon, Shen, Yin and earthly branches are all odd-numbered Yang, belonging to four-column pure Yang. It is understandable if Yi-ology enthusiasts come to this conclusion, but it is too arbitrary if Yi-ology professionals also come to this conclusion. Why? In this horoscope, Tiangan and Ding Huo's own soil hidden in the midday fire of Nianzhi are both yin, and Ding Huo Jin Xin hidden in the soil of Nianzhi is also yin. Therefore, this eight-character is not a true pure yang lattice, because there is yin in the branch, it should be called a false pure yang lattice. Dry early: bingyin year, bingshen month, jiayin day, and the time of application. Tiangan Ren, A, and C are all Yang, while Ren Geng Wu, who is buried in the ground, and Propane Wu, who is hidden in the yin, are all Yang, so the eight-character is a four-column pure Yang grid without a trace of Yin.