Aqueous Light Bleaching of Paper: Comparison of Calcium Hydroxide and Magnesium Bicarbonate Bathing Solutions

Autor:	Victoria Blyth-Hill, Terry Trosper Schaeffer, James R. Druzik
Rok vydání:	1996
Předmět:	Magnesium bicarbonate Aqueous solution Calcium hydroxide food.ingredient Museology Inorganic chemistry Conservation Reflectivity Gelatin chemistry.chemical_compound Tensile behavior food chemistry sense organs Cellulose
Zdroj:	Journal of the American Institute for Conservation. 35:219-238
ISSN:	1945-2330 0197-1360
DOI:	10.1179/019713696806113702
Popis:	The immediate and long-term effects of aqueously light bleaching both unsized and gelatin-sized cotton cellulose papers in either calcium hydroxide, Ca(OH)2, or magnesium bicarbonate, Mg(HCO3)2, solutions were investigated. After samples were treated by washing, bleaching, or control bathing in the dark, one-half of each was artificially aged, and the condition of all samples was assessed. Appearance was analyzed by reflectance spectrometry, tensile behavior was observed using stress-strain measurements, and pH and gelatin content in the papers were measured with modified TAPPI standard measurement procedures. The results showed that exposure to light per se during the bleaching process did not adversely affect the properties of the papers. It appeared that aqueous light bleaching of the unsized paper was equally effective in either solution. The visible changes in appearance, as well as alterations in other properties of the gelatin-sized paper, were influenced by the partial removal of sizing up...
Databáze:	OpenAIRE
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