1. The words on the carbon paper are missing. If there are grooves on the paper after writing, you can sketch along the mark again with a colorless ballpoint pen.

2. If there is no mark, you can use the same batch of carbon paper for force spectrum analysis.

3. There are writing scratches on the imprint of carbon paper. Pencil lead can be scraped into fine powder, scattered in the place with handwriting, and the powder can be scraped off.