I may add test logs later, but this is what I have going to now. Cheers.
So, this kind of follows the standard "generic magic item" formula that was very popular 8-10 years ago, and still gets attempted fairly often nowadays, but rarely goes well. There are also a couple other standard pitfalls as well, including the slightly-jokey note at the end from an irate researcher calling out people for not doing their job right that just ends up making the Foundation look incompetent. That can break suspension of disbelief for readers, since the Foundation is supposed to be professional.
Furthermore, your containment procedures are problematic. Why just a locker? Wouldn't it make more sense to keep the book in a case or something, so it doesn't accidentally open en route to a testing session if something happens while it's being handled outside the locker? Why "no optical tools" (which I'm not entirely sure is what you were going for there)? Optical instruments? No microscopes? Why would the O5 Council need to be involved with this? They have more important things to do than approve requests. Get a Senior Researcher or maaaaaybe Site Director.
Overall… this is just a book that transforms people when they read things, and apparently the effect transfers to video recordings for… some reason?
I recommend getting the base idea polished up in the Ideas and Brainstorming forum before you try fixing the draft. Go to that forum, post a quick summary of the concept you want to write up (don't link the draft unless someone asks), and reviewers there can help you make the idea more interesting.
Author there are many similarities between this draft and SCP-1025.
SCP-XXXX is to be kept in a passcode-secured locker. There are to be absolutely no video surveillance or optical tools of any kind used to observe SCP-#### during testing. Further research requires O5 approval.
SCP-1025 is to be kept in a passcode-secured locker. Further research requires O5 approval.
and
SCP-XXXX is a hardcover book, approximately 3,000 pages long. Text printed on the pages are accompanied with corresponding braille. The front cover and spine feature the title “The Encyclopedia of Earth Fauna.” The publisher’s page indicates the book was printed in 20██ by █████ & ██████ Inc. No other copies of a book with that title and publisher have been found, and no record of the publishers exist.
SCP-1025 is a hardcover book, approximately 1,500 pages long. The front cover and spine feature the title "The Encyclopedia of Common Diseases." The publisher's page indicates the book was printed in 19██ by █████ Press. No other copies of a book with that title and publisher have been found, and no record of the publisher exists.
Furthermore, both of these are effectively encyclopedias that affect people as they read specific entries. While there are some additional conceptual similarities to SCP-3660 as well, I believe these specific lines are most important.
While the concept is one you can follow through with however you wish, I recommend that you differentiate your special containment procedures and description from those of SCP-1025. As far the content, I agree with what Zyn said earlier.