If there is an eraser, the competitiveness of pencils will be unparalleled.

Li Mengxi didn't know what the pencil was made of, but he vaguely remembered that it seemed to be rubber.

There is no rubber, but ordinary glue does.

Li Mengxi had just done an experiment with glue a few days ago. At that time, he wanted to use glue to make resin lenses but failed. He did not expect that glue would have other uses so soon.

Li Mengxi found various colloids and wanted to erase the pencil writing on the paper. Finally, after a lot of testing and tinkering, Li Mengxi succeeded in creating an eraser that could erase the writing.

A few days ago, Li Mengxi randomly added acid, alkali, and various other things to the glue, and the test of making lenses failed.

After a few days, I still added acid and alkali and tried randomly. I tried rosin, fish glue and leather glue. Boil it with oil. After drying, it turned into a piece. I soaked it in alkali for a while and dried it again.

, the connecting block made by wiping the pencil writing can erase the writing in one go.

The product line has closed the loop. With the eraser, pencil writing can be easily erased, so paper can be reused, so pencils can be sold well, so erasers can also be sold well.

——

Li Mengxi's calligraphy writing is very average. After all this time, his calligraphy has not improved much.

After the pencil was ready, Li Mengxi wrote seven or eight characters in a row until his hand gradually returned and the characters became more and more beautiful.

Liu Bei and others heard that Li Mengxi had made a kind of ink pen, and came to take a look. When they saw the neat and beautiful pencil handwriting written by Li Mengxi, they were amazed. Everyone had always thought that Li Mengxi was poor at calligraphy, but they did not expect that Li Mengxi could write calligraphy.

The writing is elegant and flowing.
Chapter completed!