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Vol. XXX, 2006
CASE STUDY : "CONSERVATION OF PAPER DOCUMENT"
109
Paper Strips and Sellotape Removal:
Paper strips and sellotape were found at the rear side of paper document after removal of cotton cloth lining. Paper strips were removed by the solution of water and methanol (1:1) solution.
Sellotape was removed by dichloromethane. Cleaning:
After removal of cotton cloth at many portion dark black powdery substance was left because of previously chosen faulty adhesive, and its uneven application. The paper document was given a bath in tray with the solu water and methanol. By this bath almost all the dirt and stains from document has been removed (figure 5). The remaining stains were removed by the carbon tetra chloride and dichloromethane.
The cotton cloth has given a bath of water.
سواران من را با این تنه، وہ
stepnego
figure 5 - removal of stain from same portion of figure 2
De-acidification:
After the removal of stains from the document application of 2% buffer solution of Barrium Hydroxide has been done to neutralize the acidity (pH 8 by pH strip) and to protect the document from further threat in increasing of acidity.
The cotton cloth was also found acidic (pH 5) and it was given a bath of Calcium Hydroxide and Calcium Bicarbonate in respective manner. After the process the pH was checked by the pH strip and it was recorded 8.
