Preservation Beat

Wednesday, October 7, 2009

The objects we have received since the flood span a wide range of materials. Since we couldn’t work on everything immediately, one of the first things we had to address was proper storage. The wooden objects were set out to dry as were the baskets and miscellaneous plastic, ceramic, glass items. The metals however presented a problem. They were rusting and since we weren’t able to get to them immediately we needed to arrest the deterioration somehow.

After doing some research and consulting with Steve Stenstrom, an objects conservator, we bought large plastic tubs in which we could create a micro-environment for the metal objects. This allowed us more control over the condition of their surroundings. We put packages of dessicant in the tubs with the metals to absorb any moisture which might contribute to the deterioration of the metal. The dessicant packets were switched out periodically and we were able to slow the process of rusting until we had a chance to stabilize the objects.

The items in the tub to the left are already cleaned and waiting to go back home to the African American Museum of Iowa.

Thursday, September 24, 2009

When we got the books, maunscripts, and artifacts back to the University one of our first, and largest, tasks was to put things in some semblance of order. This was mainly done for museum artifacts as opposed to the books and manuscripts which tend to be a bit easier to identify. We had a rough idea of what we should have and the curators were extremely helpful but many items had tags obscured by mud or ink that had run.

The African American Museum is using a program called Past Perfect which allows us to see images of items before the flood. This has been invaluable in cases where we don’t know exactly how much treatment an object needs. We don’t want to remove a finish because we think it is staining from the flood. We also do not want to “overclean” objects, taking away from their provenance.

Thursday, September 17, 2009

Finally sending some ledgers home!! Leigh Ann Randak came to the Conservation Lab today to pick up 42 finished ledgers and the completed collection of re-boxed court dockets!!

This means we are nearly half way through the ledger project and that we’re making progress! Many of these projects are so long that it is hard to gauge our progress so when we can send things back to their museums it is very satisfying. The ledgers are mainly record books from the Johnson County Historical Society. Many of these books are enormous and in addition to the satisfaction of having them finished, it will be helpful to have the extra space. Now we just have to get those LP’s sent home.

Monday, August 3, 2009

Ongoing efforts to clean and flatten flood-affected archives manuscripts from the African American Museum of Iowa have turned up yet another form of adherograph deterioration. (See June 30, 2009 entry)

As seen in the example to the left, the powder medium that holds the adherograph text image has irreversibly adhered to the back of a preceding document page.  Unable to separate the two, I decided to scan both pieces of the damaged document and then attempt to reunite them in Photoshop.

The first step was to flip the fragment horizontally.  Though only the back of the reversed fragment text was visible through the adherograph medium, flipping it over digitally created a faint, though workable positive. 

Note the altered color of the reunited fragment.  Through a haphazard process of tweaking color levels and saturations I was able to pull the text out, making it as legible as possible.  After doing so, reducing the image from color to black and white serves to isolate the information from the discolored document carrier.

 This detail, captured after converting document to black and white, shows that while the texture of the adherograph medium remains cumbersome, the information is again legible. 

This second example details another completed document as well as its original post-flood condition.  While this process is probably too time consuming in many situations, experimenting with the procedure was a valuable experience.  Not only is there now a workflow for this in the future, but it also raises some interesting questions about disaster recovery, institutional resources, and policies pertaining to discarding and reformatting.

Sunday, July 19, 2009

This weekend I’ve started working with the Johnson County Historical Society book collection. So far they have required some dry cleaning, mending and flattening. I’ve been using the vacuum packer to flatten them which has been very effective and is really fun to watch. The damage is similar to that of the ledgers but since the books are smaller it goes a little faster. We still have a yearbook collection and the rest of the ledgers to do so I’m not going to run out of books anytime soon!

Thursday, July 16, 2009

Â
We have been experimenting with a fancy new vacuum packer, generally used for food preservation. We are using it to flatten books and other paper items. It would be inefficient for batch work because of all the material that needs to be cut to size but for especially warped books it is very effective. 

We cut blotter pieces, card, and book board all to size.  All of the interleaving material must be cut to the size of the book so that the edges don’t interfere with the sealing of the bag. The inside of the book is lightly misted, and the blotter sheets placed inside.  The book is sandwiched between pieces of blotter, card, and book board.  Rubber bands hold the stack together. The stack is then placed inside a special plastic bag. 

 

When an item is placed in the vacuum sealer, all the air is sucked out of the bag and it is sealed closed. During this process the moisture from the pages is drawn into the dry blotter between the pages. The pages, which were relaxed by the moisture, are drawn flat by the pressure. We generally leave a book in the sealed bag overnight. Ideally, we open it the next day and the book is perfectly flat.

Monday, July 13, 2009

Many of the files from the African American Museum contain various forms of correspondence. There are many postcards and letters with their original stamps. When these already fragile envelopes were faced with the flood, the stamps detached to end in a pile at the bottom of the file folder.

The second project I gave Kallie was to reunite the stamps with their respective letters and postcards. This was a fun project because it’s like putting together a puzzle and some of the stamps are pretty interesting. I had her reattach the stamps using wheat starch paste applied with a small brush. When the stamp was in position, a small square of blotter was placed over it and weighted to absorb any excess moisture and prevent warping.

Friday, July 10, 2009

We have a new  volunteer! Kallie Holt, a Junior at the University of Iowa has volunteered to work 8 hours a week here in the Conservation Lab.

The first project I gave her was the cleaning of a collection of small miscellaneous items from the African American Museum. These objects range from pacemakers to a wooden gavel and everything in between. Most of the collection belonged to a medical doctor, hence the medical paraphernalia and miniature lungs which you can see at the bottom of the photo on the right.  Creepy.

Tuesday, July 7, 2009

We have encountered every problem in the book (no pun intended) while treating these ledgers for the Johnson County Historical Society. These two pictures of the same ledger are good examples. The structure of the book was sound. It needed a little bit of cosmetic repair and hinge repair. The inside is a different story. Almost all the pages are illegible, the ink has run and bled obscuring most of the text in the ledger.

In the front of the ledger was taped a small pamphlet. It was in relatively good shape. When it
got wet in the flood some of the dye from the orange paper transferred to the pages around it. I dry cleaned it, removed the staples and took off the tape with a heat spatula and vinyl eraser.

The tape left in the ledger I did not remove because it would have made a mess of the paper trying to scrape and melt it off. While it is not ideal to have tape in the book, as it gets older the tape will become brittle and flake away doing far less damage.

Monday, July 6, 2009

There are several different types of ledgers from the Johnson County Historical Society. This ledger was completely detached from the covers, but the case was intact. The spine and corner pieces were in good shape but the cover cloth was warped and bunched.

I began with the text block. I tipped in some pages that had become detached and then put the ledger in the job backer to re-form the round of the spine. It’s not hard to do with these books since they are so used to being rounded they just need a little coaxing. When I got the spine into the position I wanted it I used wheat paste to line the spine with a piece of kozo, a thin japanese paper which I stippled on with a stiff brush. While that dried I used a piece of kozo and wheat paste to reinforce the spine inside the cover, carrying it across onto the boards to give the hinge area more strength. I added new black cloth to the covers to “pretty them up” and set it under weight to dry. When the spine of the text block was dry, I added a cambric (cloth) lining with flanges overhanging each side of the spine about an inch. When that was dry I put the text block back into the original cover using pva to put down the cambric onto the japanese paper lining inside the cover. I then pasted the original paste-downs to the cover using wheat paste. When the whole thing was put together I placed it in between press boards and put it in the job backer so it would dry in the right shape.