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Conservation Information Network (BCIN)
Author: Neevel, Johan G.
Title Article/Chapter: "Phytate: a potential conservation agent for the treatment of ink corrosion caused by irongall inks"
Title of Source: Restaurator: international journal for the preservation of library and archival material
AATA Number: 33-827
Date of Publication: 1995
Language Text: English
Language Summaries: English; French; German
References: Includes bibliographical references
Subject Keywords English: phytate;conservation;ink;corrosion;iron;gall;paper -- CAL
Subject Keywords French: Papier; Altération; Encre; Encre métallogallique; Conservation; Essai;
Subject Keywords English 2: Art and Archaeology Technical Abstracts; corrosion; ink -- AATA
Subject Keywords English 3: Paper; Deterioration; Ink; Irongall ink; Conservation; Test -- ICCROM
Subject Label: Paper; books; and library and archival materials;
Subject Material Test: Phytate
Abstract: Ink corrosion, the degradation of paper by iron-gall inks, destroys paper manuscripts and pen drawings. The degradation can be attributed to both acid hydrolysis and iron(II)-catalysed oxidation of cellulose. Phytic acid, a natural antioxidant, blocks the latter process. Its action has been investigated by simulating ink corrosion with accelerated ageing tests at 90°C and a relative humidity, cycling each 3 hours between 35 and 80per thousand. Mechanical strength was tested with a bursting tester at screen patterns, made with an iron-gall ink of a composition representative of old ink recipes. When ink corrosion occurred, the aged paper samples burst at the patterns. By deacidigication with an aqueous solution of magnesium bicarbonate the half-value period of the bursting strength increased from 6 to 15 days. In combination with a treatment with an aqueous solution of sodium phytate the half-value period increased to 23 days. Surface-pH values of both treated sets were similar. Therefore the increase in stability must be due to the antioxidant function of phytate. Further research should lead to practical phytate-based conservation treatments of manuscripts and pen drawings threatened by ink corrosion.
Originating Institution: MCI
Location of Document: MCI;ICCROM
ICCROM Shelf: Per. International 2
MCI Accession Number: 7036
Record Type: Abstract
Literature Type: Serial
Bibliographic Level: Analytic
Old BCIN Number: 201145
BCIN Number: 143325