Everyone is familiar with this famous saying, and primary school students know that "shine on you is better than blue", because this sentence is always quoted by the teacher when coloring in painting class; Teachers often use this sentence to motivate students and tell them that if you listen to the teacher now, you will think that the teacher is knowledgeable. In fact, if you study hard, you will learn more knowledge than the teacher. Compare teachers to "blue" and students to "green". Students' knowledge comes from teachers' education, but it is often more comprehensive than teachers' knowledge.

Now we often say "shine on you is better than blue". The exact words of this sentence were written in Yang Mo's Song of Youth. Don't you know that this sentence was first written by Xunzi during the Warring States Period?

Mr. Wang said: I can't learn.

Green is taken from blue, and green is blue; Ice, water, but colder than water. Wood is straight in the rope, not a wheel, and its curve is in the gauge. Although there is a crisis, those who stop coming forward will make it happen. Therefore, the wood is straight by the rope, the gold is sharp, the gentleman is knowledgeable, and he saves himself every day, so he knows clearly without fault.

Interpretation: "Green" indigo is extracted from blue grass, but it is bluer than blue grass.

This comes from people's life practice, which means that students are educated and taught by teachers, and students have surpassed teachers through learning and growth.

It is the result of social development that each generation is stronger than the next.

However, during the Warring States period, we had such a profound understanding of color, which showed that the intelligence of the ancients should not be underestimated.

According to historical records, China's printing and dyeing technology was mature and widely used in Qin and Han Dynasties.

Legend has it that it was in the Paleolithic Age 50,000 years ago and10,000 years ago. There is textual research on plant dyeing.

All this makes those of us who live in modern society feel ashamed.