Photographs can be preserved by keeping
them in cool, dry place out of light. Don’t forget to label them
appropriately. Now what about
paper? How do you keep your important papers whether they are personal papers
or those in an archive? Well, what matters most is the type of paper that you
have. If you are a big newspaper
clipper, expect anything you save made of newsprint will turn yellow and
brittle in a pretty short amount of time. Why? Well newsprint is an example of cheaply made paper made
from wood pulp. Wood has
lignin, which is an acid. It is
this acid in newsprint that causes the deterioration. On the other end of the spectrum is
bond paper. Bond paper is made
from cotton rags, which do not have acid.
They will last 100 years if kept out of the sun and in a cool and dry
place next to other non-acidic papers. That's why colleges have historically demanded that masters theses and dissertations be printed on bond
paper because they want the material to last as long as possible.
Other materials like archival non-acidic file folders or other
non-acidic products have had the acid (lignin usually removed) to extend their
shelf life. They can help reduce
the migration of acid from acidic paper to non-acidic material. Did I mention that acid will move from
one piece of paper and chemically alter material next to it? Test this by
putting a news clipping on a piece of paper and leave it in direct sunlight for
several weeks. When you lift the
news clipping a brownish stain (acid) will be left on the paper underneath.
So
what can you do to preserve your material? Not much if it is newsprint. Archives microfilm their newspapers. Microfilm is stable and will last for
about 100 years. The other
recourse is to copy the article onto bond paper and throw the clipping
away. If you must save the
clipping use acid free paper or other archival material between the clipping and other
papers. The clipping will still deteriorate
but you will protect the surrounding papers at least a little. The other way to protect paper is to reduce human
handling. Some archives require
white clean gloves be used when handling paper. I find I do more harm than good
with gloves. Do wash your hands. No drinks or food around paper material you
want to preserve. No rubber bands
to bundle paper together. Rubber bands deteriorate, turn black and may stick permanently to the
paper. Metal paper clips and
staples will rust over time if there is moisture in the air. Use plastic paper clips. You can keep paper together by folding
a blank piece around the group you were going to staple. Or go ahead and staple if you must just
know that it may rust over time.
Other considerations – Store paper in archival boxes or in metal filing cabinets.
Never store paper products in wooden containers – acidic, remember?
Archives use special non-acidic shelving for their collections. Coating on that shelving does
matter. Baked coating is
recommended. For archives that
have wooden shelving and can’t afford to replace it, a cheap reasonably
effective solution is to line the shelves with archival board (a non-acidic
cardboard only available from archival supply houses).
The
newest solution to preservation is, of course, digitization. It works, but we’re just not sure for
how long. I have files in Excel,
for instance, that can only be read using old Excel software. The newer versions don’t support the
older ones. You must keep upgrading your files to stay current and I wasn't quick enough. (Of course, there are "how to upgrade" these files on line. I should do that but haven't.) For now saving as pdfs or in Word are
the best options for long-term usefulness. For photographs JPEG and TIFF have stayed
readable so far.
For more information on paper preservation
see:
Information on archival shelving
http://www.archives.gov/foia/directives/nara1571.pdf
“Use a powder-coating system
to paint all painted metal shelving surfaces (including map cases, museum
cabinets, etc.) used within all records areas. The powder-coating polymer must
be a polyester epoxy hybrid or best equivalent available that passes NWT- conducted
or independent lab tests for hardness, coating stability, bending, coating
adhesion, and coating durability. The paint must not exceed the off-gassing
limits specified in Appendix B. Do not apply powder coating to the metal
surfaces onsite in the storage area.”