Avid blog followers may remember this post from back in August of 2008... Those oversized maps and documents that we unrolled for the first time so many months ago are finally receiving conservation treatment!
The rolled documents arrived to HSP housed in long plastic bags, tied at both ends with cotton tape.
Each document is removed from the bag, slowly unrolled and weights are used to hold the document open.
Most of the maps are covered with a layer of dust, soot, and dirt that is removed with vulcanized rubber erasers and Nilfisk vaccuum.
The documents are rolled around 4" diameter acid-free, lignen-free archival tubes with a layer of Microchamber paper and an outer layer of Tyvek. The tube is cut to size for each document using a hacksaw and then sanded smooth.
Cotton tape is used to secure the Tyvek around the rolled document. The newly-housed documents will be labeled and stored on shelves.