Why is the "blackboard" used in school teaching green?

Because the early blackboard was really black, it was called blackboard, and the later improved blackboard turned green, in order to protect students' eyesight and reduce reflection. Nowadays, blackboards, whether in kindergartens, primary schools, junior high schools or universities, are mostly dark green, because dark green blackboards can give full play to their value, make it easier for teachers to write, and make students' eyes less tired.

First, the early blackboard was black.

In the 1980s and 1990s, blackboards were mostly black, white or beige, with black accounting for the largest part. The materials used in the early blackboard were very casual. That's a board. Ordinary wooden boards are painted with a layer of black paint at school, which can be made into a simple and rough blackboard for teachers to write on the blackboard in class. At that time, because the chalk was white, the contrast was more distinct after the blackboard was painted black, which was easier for students to see, so most of it was black.

Second, the improved blackboard is dark green, which can reduce the reflection.

Later, with the development of the times, simple blackboards became less and less common. Through investigation and study, scientists found that the original blackboard was rough in quality, easy to break and especially easy to reflect light. If students sit in a remote corner in class, it is easy to see the words on the blackboard, so they fall behind in their homework, so they improve the blackboard. Nowadays, the blackboard is made of new composite materials and turned into dark green, which can reduce the reflection and make students see more clearly.

Third, the dark green blackboard can also protect students' eyesight.

In addition, the blackboard made of dark green new composite materials can also protect students' eyes. Investigation shows that students who often look at green things will not get tired easily. It is inevitable that students always stare at the blackboard during a day's class in the classroom. If the color of the blackboard is changed to dark green, it will not stimulate students' eyes, but also better protect students' eyesight, which is also a matter of killing two birds with one stone.

Dear readers, do you understand? If you have any questions, please leave a message in the comment area and we will discuss it together.