Treatment

Mending & Re-lining
	During Treatment	After Treatment
Maps that are torn or have large pieces missing are cumbersome to handle, transport and scan. After the old backing is removed, the paper map can be repaired with long-fibered tissue and paste .
A partial re-lining with long-fibered tissue and linen.
Significant areas of loss are mended with muslin patches and Beva D-8.
After the map has been stabilized, it has enough flexibility to roll onto a large diameter core in order to transported to the scanning facility.
Maps with torn and deteriorated backing are re-lined with long fiber tissue and muslin.

Humidification & Flattening
	A map that has been stored tightly rolled over the years (picture at left) can crack and break when unrolled.  In order to unroll these maps safely without causing additional damage the maps are placed in a humidity chamber.  As the map absorbs humidity inside the chamber it relaxes and is able to be carefully unrolled a section at a time without cracking. (below left) Once the map is completely unrolled it is taken out of the humidity chamber and placed between felts to dry flat. (below right)

Tape Removal & Adhesive Reduction
Many maps were previously repaired with various kinds of pressure-sensitive tape. The tape must be removed, and the adhesive reduced in order to adhere a new mend over the tear.
Old tapes and glues applied to the back of a map become rigid over time causing the map to crease and crack. The old tapes and glues are removed and the map is re-lined with long fiber tissue.	During treatment	After treatment
After removing tape from the front of a map any remaining adhesive residue is reduced.   The white residue in the picture is covering up part of the drawing and after removal the drawing is visible.