What is the fine white powder in book pages. The books do not smell musty. Is it mold Can it be cleaned off and be safe for usage?

The fine white powder in book pages is mildew, not mold. Mildew may not cause the books to smell musty. It can be cleaned off and be safe for usage by cleaning the mildew pages with a soft brush. Apply a small amount of denatured alcohol to a soft cloth and carefully treat the affected pages.