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Desirable Initial Tear Resistance Values for Book
The Restoration Category
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17th century accelerated aging acid papers acid samples Five alum aluminum sulfate Aquapel average basis weight brittle cellulose chemical wood fibers condition cross direction cross printing deacidification deterioration pattern Dioscorides Durable easily torn Elmendorf Tear Resistance embrittlement endurance and tear estimated half-life Evaluation exhibit expected fiber length fold and tear folding endurance test folding endurance values folds M.I.T. Folds PH Tear grams tear Elmendorf H.W. Poor high acidity indicate initial folding endurance initial folding strength initial tear resistance iron gall ink laboratory longevity low strength lower storage method naturally aged papers newsprint number of folds old papers papers composed permanent/durable papers pH cold extraction pH ranges pH values possible potential procedures rate of deterioration regression line restoration category Richmond rosin sheet spine storage temperature sulfuric acid tear resistance test tear resistance values tension test data Tester unusable Virginia State Library W. J. Barrow weak category weakened