Reflections on reading history: When did the Yellow River turn yellow?

The Yellow River is called "River" for short in ancient books. The Yellow River even said that according to the entry (perhaps not the earliest use case), it began in Wei and Jin Dynasties. But the Yellow River should have turned yellow long ago. One of the evidences is that there is a message in the Book of the Later Han Dynasty. Around 150, the Yellow River was found to be clear. He was shocked and thought it was a vision, so he wrote to the court, saying that it meant that some governors wanted to usurp the throne as emperors. Because since the Spring and Autumn Period, even before the emperor's era, the Yellow River water has been turbid. Ignore this person's intention of attaching natural vision to politics for the time being, and only pay attention to his expression of the history of the Yellow River. If his memory is true, then at least from the Spring and Autumn Period, the Yellow River has been colored. Of course, the implied premise of our topic is that the Yellow River was once crystal clear. What if the Yellow River turns yellow? Imagine, before green plants were born on the earth, wasn't there sediment in the river? Related historical materials: Biography of Xiang Kai in the Later Han Dynasty: Since the Spring and Autumn Period of the case and the ancient emperors, there has been no study of Heqing's self-destruction. I thought the river, princes also. Clear belongs to yang, turbid belongs to yin. The river is turbid and anti-Qing, the yin wants to be yang, and the princes want to be emperors.