What is quicklime brushed on a book

Does the questioner want to ask "what is the meaning of the white lime brushed on the book"?

1, Brushing lime on trees in winter can sterilize them.

2. Brushing trees with white lime can keep them warm and protect them from freezing.

3, Brushing trees with lime dust can also control tree pests, and for many insects, lime is poisonous.