Archive Tips: NPS Conserve O Grams are a Fantastic Free Resource

Caring for a private collection of historical material can be overwhelming, especially if you have not had museum training or do not have an archivist background. Things are much better this day and age though, because there are a number of resources available on the internet that can help you. Today, I’m highlighting one of the most prolific ones, the Conserve O Grams put out by the National Park Service.
The National Park Service has been releasing Conserve O Grams for decades, with the earliest dated issues on the website going back to 1993. According to their website, “The National Park Service Conserve O Grams are short, focused technical leaflets that provide practical and easy-to-use guidance on the care of museum collections. The leaflets are geared towards staff responsible for collections care and preservation. They cover procedures, techniques, and materials used in collections management, as well as care of different types of collection objects and materials. New topics are added as needed and out-of-date issues are revised or deleted.”

Covering over 186 topics ranging from collection preservation of a variety of object types, to fire safety, pest control, and disaster responses, Conserve O Grams provide a wealth of information regularly used by museum professionals. While some topics may not apply to private collectors, all aspects of collections care and disaster responses do.
How many of you with archive collections have ever run across a rusty paperclip or straight pin holding documents together? Or found a rotten rubber band stuck to an ambrotype case (that’s a future Angry Archivist post)? This Conserve O Gram issue from July 1993 covers all those things and offers suggestions on removing them, what tools to use (and not use), and also councils you on why some fasteners (such as historic seals) should remain. You can see it here: https://www.nps.gov/subjects/museums/upload/19-05_508.pdf
How many of you know the proper humidity level for storing glass plate negatives and ambrotypes? How many of you have found ambrotypes with a flaking black varnish on the back? If you store these images with a relative humidity level of less than 30% those antique emulsions and varnishes will start to corrode and flake off. Learn about how to handle different types of photographs here: https://www.nps.gov/subjects/museums/upload/14-05_508.pdf
As collectors, one thing we love to do is show off our collection. There’s certainly no shame in that, and it’s really no different than putting on a museum exhibit in your own home. However, like a museum, it’s important to follow archival guidelines when displaying our treasure troves. This particular Conserve O Gram covers putting paper on exhibit and the proper mounting techniques. One very important thing to consider is that paper expands and contracts based on humidity. Therefore, it needs to be mounted in something that allows it to “breathe.” I’ve seen so many CDVs encased in hard plastic that does no favors whatsoever for the documents within them. “Once mounted, the document, art work, or photograph does not touch the framing glass or plastic, but is held apart from it by a window mat or spacer.” You may not wish to mount your documents or photographs as described in this particular Conserve O Gram, but the information contained within it on why you should not wedge something into hard plastic is very useful. You can find this issue here: https://www.nps.gov/subjects/museums/upload/13-04_508.pdf
When I took my first collections management class in college many years ago, I was first introduced to Conserve O Grams. I’ve referenced them countless times over the course of my career as a museum director and archivist, and I continue to reference them both professionally and personally as I maintain a large archive of documents at my home. I encourage any collector no matter how long you’ve been collecting to please comb through the various topics covered with Conserve O Grams and to consult them first with any archival questions you may have before asking Facebook groups for their input. All too often, those groups are full of well-meaning folks who want to help, but they are typically not professionally trained. I’ve got a lengthy list of stories of bad advice and bad care methods I’ve encountered over the years. The more recent ones I’m chronicling on the “Angry Archivist” posts on this site.
You can view all of the National Park Service Conserve O Grams here: https://www.nps.gov/subjects/museums/conserve-o-grams.htm
I hope you find them as helpful as I have over the years, and I hope they are old news for many of you because that means you’re already using them! Which is awesome!