Tobias,
You have brought up some wonderful questions and may I suggest that you place the items in archival type document protectors and sleeves. Mylar is archival safe and can be found online and in some cases at hobby stores where they sell stamps and coins as well as paper money. These come in various sizes and can be cut to fit the documents in question.
There are so many different variables that have to be taken into consideration, temperature, climate, humidity, light, air quality, the list goes on and on...and many will dispute or argue that they see no differences and have not done anything to go out of the way to preserve/conserve their collections but they may not see the long term affects/damages that may be done...
There are several archival businesses that the museums here in the United States for proper storage as well as exhibit use. These businesses are expensive but there are also fine substitute places that will have ARCHIVAL document protectors such as Hobby Lobby and most likely any stamp and coin shops...
University Products and Gaylord are the two top companies: (See links)
Archival Storage | Acid-Free Boxes, Folders, Envelopes, Clear Enclosur
Archival & Acid-Free File Folders, Hanging Folders, Heavy Duty | Gaylord Archival
One question I do have is about the lights in your display case.. If they are LED lights they tend to give off less heat which will help preserve the integrity of the documents and LEDs are preferred, but with anything over time the documents may become brittle if they are not allowed to "breathe".. If you are going to place documents in an archival protector make sure that there is at least one open end in order for air to circulate inside the folder.
Lighting is always a question that we discuss in the museum field and we talk about lumens and the wattage of lights used. Halogen and fluorescent bulbs give off incredible amounts of heat which over time "burn" objects. Soft light bulbs with low candle and lumens are the best best as well as LEDs. Another option is a filter that can be placed over the bulb. These break up the direct light flow and "soften" the amount of lighting that is given off.
Sorry about all the technical terminology of lumens and candlepower and all the other things, but this is something that curators must study and understand when dealing with artifacts..
Personal collections are just as important,, so I practice what I preach.. Why would I do differently with my personal artifacts when I spend so much time and care in conservation and preservation at the museum?
Handling the documents is also preferred with gloves (which you say you do which is great), either cotton or nitrile/latex are fine. You want to place a barrier between your skin and the paper. Oils and dirt's in your hands can transfer to documents and leave staining which will also cause damage after years of mishandling, another reason why many blade collectors will not handle their knives or daggers without wearing gloves due
to the risk of leaving fingerprints on the blades. The acids and oils left on the blade will after time be "etched" into the blades again causing damage.
Tobias,, you are taking the right approach with the questions you ask and museum professionals enjoy seeing this, especially in the younger generation.. When you ask these questions and take direct action you are actually helping to ensure that the artifacts will be preserved for hundreds of years,, well after I am gone and I can no longer pass my knowledge forward, so I commend you for taking such an interest in conservation and preservation..
I would be happy to have someone like you as an intern in our museum whose passion for military history is quite obvious...
Best regards, stay safe
Smitty
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