ブックタイトル未来につなぐ人類の技15　洋紙の保存と修復

概要

未来につなぐ人類の技15　洋紙の保存と修復

Treatment Options for Iron Gall Ink on PaperThis flow chart is a summary of treatment options for iron gall ink on paper with a focus on calcium phytate. It highlights key treatmentsteps and presents treatment tips. It provides experienced paper conservators with a visual map or outline of examination andtreatment steps to consider when treating works with iron gall ink. It is not a substitute for literature review and training in thetreatment of objects with iron gall ink. Refer to the conservation literature for detailed description of treatment protocols.? RCE condition 1: light or no browndiscolouration at inked areas? light color ink? Fe(II) ion test < 25? pH of paper > 5.5? thin ink lines on thick paper? paper is not absorbentLow risk of further ink corrosionTreatment may not be required?RCE condition 2 & 3: dark browndiscolouration at the inked areas?Fe(II) ion test >25?pH of paper < 5.5?thick and/or dark ink lines on thinpaper?paper is absorbentSome risk of further ink corrosionEvaluate treatment options?RCE condition 4: physical damage withserious loss of substrate?paper is brittleHigh risk of loss from mechanical damageRisk of further damage from improperhandling. The priority to mitigate the risk ofmechanical damage increases relative to theneed to mitigate further corrosion. Treatmentoptions are limited due to fragility of artifact.Consider mechanical stabilization, copying,interleaving, and cool dry storageTreatment OptionsThe treatment options described below may not be appropriate for all works on paper containing iron gall ink. For some, minimaltreatment (mechanical stabilisation) or preventive measures (interleaving, copying and/ or cool, dry storage) may be preferred.Prior to treatment, test ink solubility: alkaline water (pH8.5), ethanol (EtOH), EtOH/water, calcium phytate, calcium bicarbonate.If the ink is soluble in water but not soluble in EtOH: test with EtOH modified solutions of calcium phytate and calcium bicarbonate.Treatment application methods: immersion, and overall or local treatment and application of solutions on the paper suction table.Ink is not soluble in water orEtOH? pre-condition with EtOH orEtOH and water? wash in alkaline water (pH 8.5)? immerse in calcium phytate(pH 5.5 ? 6.0)? immerse in calciumbicarbonate (pH 5.88)? partially dry on suction tableand finish drying in a blotterstack or dry only in a blotterstack? size with gelatin? repair or line withremoistenable or solventreactivated tissueInk is slightly soluble in water,not soluble in EtOH? pre-condition with EtOH? wash or spray on suction table withalkaline water and EtOH? immerse or spray on suction tablewith EtOH diluted calcium phytate(pH 5.5 ? 6.0)? immerse or spray on suction tablewith EtOH diluted calciumbicarbonate (pH 5.88)? partially dry on suction table andfinish drying in a blotter stack ordry only in a blotter stack? repair or line with gelatinremoistenable tissue (reactivatedwith 25:75 water:EtOH) or solventreactivated tissueInk is soluble in water and EtOHOR other factors preventing chemicaltreatment, eg. artifact format,condition, resource availability? non-aqueous deacidification? repair or line with gelatinremoistenable tissue (reactivatedwith 25:75 water:EtOH) or solventreactivated tissueTreatment TipsTo prevent lateral migration of soluble acids andiron ions, AVOID humidification or local wettingof objects with iron gall ink.Fe(II) ion indicator paper should be used tomonitor completeness of phytate treatments.Highly acidic or alkaline conditions can causecolour change in iron gall inks. To avoid changesin ink colour the pH of treatment solutions andof the artifact after treatment, should be keptbetween pH 5.0 ? 8.5.Sherry, Guild, Season Tse, Maria Bedynski“Treatment Options for Iron Gall Ink on Paper”, Journal of CAC, 2013Contact: sherry.guild@pch.gc.ca図19没食子インクの処置方法をまとめたフローチャート洋紙の地図と文書、及びその他の洋紙の収蔵品の保存と修復の挑戦57