What is a word for the colored edges of book pages, opposite the spine. Is there a term for this?
I'm not looking for gilded or gold leaf, as those are both specific to golden edges, nor am I seeking a term used for especially ornamental usages. The question came to mind after looking at a math textbook that used blue color to highlight a supplemental chapter, so the usage was mostly functional.
Anyway, in case my description is lacking, here's a cool picture (a book's cover actually) showing some antique books that demonstrate rather elaborate edge designs.