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Iron gall ink higher level structure - Horizontal Nov 10 2005, Society Researchsystem, Cultural preservation institutions eg. Library & archives Research, Collection unit 3 Physical force 2, Contaminants 3 Darkening of paper with lignin, Preservation Film & microfilm, Collection unit 3 Criminals 1, Collection management Use, Prints, poster & manuscripts Collection unit 4, Collection unit 3 Fire 3, Preservation Newspaper