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17th century accelerated aging acid papers alum aluminum sulfate Aquapel basis weight book papers brittle Category—Has cellulose chemical wood fibers condition cross direction cross printing deacidification deterioration pattern Dioscorides Durability easily torn Elmendorf Tear Resistance embrittlement endurance and tear Evaluation expected Fair Fair Fair fiber length fold and tear folding endurance test folding endurance values folds M.I.T. Folds PH Tear grams tear H.W. Poor indicate initial folding endurance initial folding strength initial tear resistance iron gall ink laboratory loss of folding low strength median acid method naturally aged papers newsprint number of folds old papers papers composed permanent/durable papers pH cold extraction pH values possible potential rag fibers rate of deterioration regression line restoration category Richmond Sample Ave 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