University of Arizona
University of Arizona Report on Research

Saving Ancient Ceramics

by D.A. Barber

Spanning 2000 years of cultural traditions of the American desert southwest and northern Mexico's indigenous peoples, some 20,000 southwest Indians whole-vessel cermanics in Arizona State Museum's pottery collection reflect almost every cultural group of the region, including prehistoric Hohokam, Mogolon, Pueblo and the largest collection of Casas Grandes pottery outside of Mexico.

Being the oldest and largest anthropological museum in the Southwest; the official repository for the State; and, the largest non-federal repository for tribal lands, it makes sense the collection is housed at ASM.

Research on these vessels has formed the foundation for understanding the past but the collection is in imminent danger of deterioration due to inadequate environmental controls in the museum's two historic buildings where they are stored. Both buildings are on the National Register of Historic Places and though they are charming, their age is reflected by the lack of environmental controls. In fact, almost one-third of the collection has already shown signs of deterioration due to fluctuations in humidity and temperature and the threat requires actual physical upgrades of the museum buildings' storage and lab facilities.

This urgent need for preservation resulted in the Pottery Project, a move by museum scientists to protect and preserve the collection Ð the largest and most comprehensive of its kind and one of the nation's most significant cultural resources.

The plan is to modify and renovate an area in the north building, the former University Library building.

"The idea is to bring the collection to a single storage area and this will allow us to reorganize and better preserve it, making them a little more accessible and more secure," says Nancy Odegaard, the driving force behind the Pottery Project to provide badly needed environmental controls, relieve overcrowding and enhance access.

"The problem with the 1926 building and its various additions is that its air handlers are pretty out of date for providing adequate climate control. So to create an upgrade in that area where the pottery will be stored will provide a more stable and desirable temperature, humidity and air filtration system so that we can better preserve them," says Odegaard.

"We'll also be able to incorporate some of the concerns that Native Americans have about how the pottery is stored and handled," says Odegaard who notes some of the vessels are actually sacred burial artifacts which the museum has been repatriating long before state or federal laws were established.

At ASM since 1983 as the only conservator in the state university system, Odegaard first brought the pottery preservation problem to the forefront in the summer of 1999.

"Going public has its plus and minuses," she says, "because you sound like idiots."

[stunning graphic]
"Almost one-third of the collection has already shown signs of deterioration due to fluctuations in humidity and temperature. The idea is to bring the collection to a single storage area...to reorganize and better preserve it." -- Nancy Odegaard, Arizona State Museum Pottery Project Coordinator. (Photo: FOTOSMITH)

That public perception - that the University dropped the ball on protecting these treasures Ð is unfounded based on the size of the collection and expense of the solution - some $2 million. And the fact that funding for such projects has been spare until recently.

Unlike most other units on campus, ASM has no significant pool of major donors at a time when state budget cuts threaten the entire University system. That changed in 2000 when the Pottery Project was designated an Official Project of the Save America's Treasures - the only objects collection of Arizona's five designated projects - a public private partnership formed in 1998 between the White House Millennium Council and the National Trust for Historic Preservation to celebrate and preserve our nation's cultural legacy. Washington set aside about $30 million to be distributed among all the official projects through a granting process and ASM received $400,000.

But it got better when donor Agnese Nelms Haury, widow of ASM's second director (1938-1964) Emil W. Haury, pledged $1 million in October toward the Pottery Project. The Museum also recently received a $700,000 challenge grant from the NEH, but while they're close to the $2 million goal, not all the grant money will go to the construction project.

   

[stunning graphic]
ASM's 2003 Signature Southwest auctioned off donated contemporary vessels, including a reproduction of a Mimbres vessel, for sale to benefit the museum's efforts to build a new storage facility for the 20,000 whole vessels currently in storage.


"There's an endowment for educational activity," says Odegaard.

Still, funding is close enough to move to the next phase: Construction of a state-of-the-art vault and lab.

[stunning graphic]

[stunning graphic]
These two photos show the effects of salt effloresence on pottery, damage caused by fluctuating temperatures and humidity. (Photos: FOTOSMITH)
"We didn't have an exact floor plan when we wrote these grants because the UA does that after you have the money," explains Odegaard.

The Pottery Project's efforts to secure its collections and make them more accessible to the public and scholars includes a number of planned approaches toward reconstruction of the storage area. The collection will be gathered from its current five storage areas in two buildings into one location and placed on state-of-the-art shelving. The proposed vault will create a glass-walled storage area, which will combine with conservation to form a dynamic education and presentation venue and have "smart" computerized environmental controls.

"It's not an airlock, but it will be an improved air handling system," notes Odegaard.

One serious problem is that salts found within the soil throughout the southwest desert regions remain in the ceramic material long after their original firing through to their current storage status. A change in humidity during Tucson's rainy season brings those salts to the surface, which eventually results in the crumbly breakdown of the ceramic material itself over a long period of time, particularly with vessels that were used for water storage.

"We don't want to have to invasively treat everything, it's not feasible, it's not prudent and it's not appropriate," explains Odegaard. "You can arrest it to a great extent by controlling the environment."

It sounds like a simple storage problem, but 2,000-year-old ceramics are touchy.

"One of the big problems with ceramics is if they jiggle or fall, they break so we have to work in storage precautions that mitigate problems of handling and vibration," says Odegaard.

[stunning graphic]
Diane Dittemore, a senior curatorial specialist, pores over ASM's prehistoric Hohokam collection. (Photo: FOTOSMITH)


"The storage furniture that we've selected in our grant proposal will take this into account."

The new conservation science lab will also have environmental controls, though with its own unique problems to be solved during construction.

"Once you introduce plumbing and different people into the area, you're changing the relative humidity whether you want to or not," says Odegaard. "So it means that not just any office space is going to work."

Over the next few months, Odegaard and her staff are doing smaller studies and experiments on the collection in preparation for the final move by getting different protocols and other aspects of the project in place.

"Often the public thinks that unless it's on display, it's not being used," says Odegaard.

"That's not exactly true. We have a lot of students, a lot of researchers and a lot of visitors who actually work very closely with the collection on a daily basis."


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