ブックタイトルConservation and Restoration of Western Paper
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Conservation and Restoration of Western Paper
and treatment modules to conservators andpublish articles to more widely disseminateinformation.The calcium phytate treatment protocolfor iron gall ink corrosion first proposedby Neevel in the 1990s has become thestandard treatment preference 5 (Photo 16).Phytate prevents the iron (II) catalyzedformation of free radicals by binding theiron (II) ions and converting them to iron(III) phytates. The treatment is complex,and requires immersing the artifact inseveral aqueous solutions. It is not withoutrisk, especially to iron gall ink artifacts in anCondition Rating 1Good condition? no or light brown discolorationat the inked areasCondition Rating 2Fair condition? dark brown discoloration at theinked areas? no mechanical damageCondition Rating 3Poor condition? mechanical damage (cracks) atthe inked areasCondition Rating 4Bad condition? serious loss of substanceDiagram 4 4 levels of iron gall ink condition. (Netherlands Cultural Heritage Agency chart)66