Why doesn't Gan Ling use a blood test to tell who is really Gege?

It is said that when Emperor Ganling was young, he was really a romantic emperor, and he went to Jiangnan several times by himself. On the surface, he went to observe the people's feelings, but in fact, besides his official duties, he was more looking for an affair, so there was a story about him and Xia.

But after all, Qianlong was the emperor, and he always wanted to go back to the Forbidden City. Later, he left the pregnant summer alone in Jiangnan. Although he left enough money, he still owed Xia a lot.

Many years later, Xia's daughter came to Beijing to find her relatives with the birthday left by Qianlong, and met the swallow halfway. Because Qianlong is the head of a country, it is too difficult for ordinary people to meet Emperor Qianlong, not to mention Xia Ziwei, who has no real power.

So, the swallow made a little effort to send the painting and was recognized as his daughter by Qianlong. As a result, the Swallow felt sorry for poor Wei Zi, so he confessed to Wei Zi that he was not really Gege, and Wei Zi was really Gege, which provoked the anger of Qianlong and the whole Qing royal family at that time.

Especially at that time, the Queen pointed the finger at Swallow and Wei Zi, saying that they might all be impostors. Even sent these two gege to the execution ground to be beheaded. But what we really don't understand is why emperor Qianlong didn't use the traditional blood test left by their ancestors even if he was beheaded.

You know, in "Empresses in the Palace", Qianlong's father Yongzheng used this trick on Zhen Xuan's daughter, and in the ancient social system, there was indeed a blood test. Wei Zi and Swallow, who is true and who is false, can you quickly verify with the simplest method? Why doesn't ganlong use it directly?

Actually, doesn't Qianlong know this method himself? He knows this, but he just doesn't want to use it. Who is the real princess and the fake princess between Swallow and Wei Zi? Gan Long knows all about it. If Wei Zi is true and the swallow is false, then his face will be lost.

You know, when Little Swallow was just named Princess Zhu Huan, people all over Beijing knew about it. Now they say she is a fake. What will Beijingers think? This is detrimental to the face of the Great Qing Dynasty, and Qianlong is most afraid of losing face. Besides, he has begun to like these two girls from the bottom of his heart. Wei Zi once saved Gan Long's life, and his friendship is not generally deep.

Therefore, instead of the larger foe, it is better to admit it completely, and still achieve his reputation as a benevolent monarch. Why not? Anyway, Qing's daughter can't inherit the unification, and there is no threat to the royal blood. It's just a matter of reputation!