This post is for everyone who believes library books “borrowed” belong personally to them. There is a word for the disease that irks me most and it is “marginalia”! The need of a person to write notes in the margins, underline or highlight text, use pen, marker, pencil, or anything that is either impossible or time consuming to remove. The next reader of the book doesn’t care what you thought and needs to form an impression for their own research!
If you need to mark pages for reference in library books for your research, use post its, page markers (not dog earring the page please!), slips of scrap paper, anything but writing on the pages!