A very interesting resource from Scrapbook.com, a full article dedicated to the preservation and protection of photos, documents, and valuable papers worldwide. It is a comprehensive page about paper, document, and photo preservation.

It covers everything from understanding how paper deteriorates, what different papers are composed of, and the specific techniques and materials needed to protect, preserve, and archive documents. This page, enriched with images and videos, is designed to be the most extensive, and comprehensive page on the protection and preservation of paper on the internet.

https://www.scrapbook.com/articles/preservation-of-photos-documents-papers