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The oxidation of ferrous iron in iron gall ink

โœ Scribed by Rhodes, Henry T. F.

Publisher
Wiley (John Wiley & Sons)
Year
1940
Weight
343 KB
Volume
59
Category
Article
ISSN
0368-4075

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โœฆ Synopsis

Tlic objcct of this inrcstigntion wns to study tlic osirlntioti rate of ferrous iron in iron gnll inks upou pnpcr. From tlic point of vicw of tlic csniiiination of qucstioncd tlocunictits, tlic iclciitificntion of fcrrous iron in inks nnd its osidfition ltnvc considcrablc importancc. Tlic cstcnt of tltc osidntiou of tlic iroti is a incnsurc of thc ngc of tlrc iiik. It Iuis long bccn kiiom~i t l t i i t ink iipoii piper uiitlcrgocs osidntion which involvcs n cltnngc iti thc irou salts from tlic ferrous to tlic ferric state.

Sonncnscltcin (Lcltrbuch tlcr gcriclitlicl~cii Clicniic, 1581, 3F1) wiis nniong tlic first to obscrrc tlic incrcnscd rcsistiiucc of nirititrc gnllotiiniiatcs of iron to ncids iind otlicr rcngcnts. Norc rccciitly tltc niccltnnisiii of ositlrition ltns bccn stutlicd by l\litclicll (,\nnlyst, 1920, 45, 2,li'). Tliis iinthor Itiis shown tlint tltc cliriuge of tltc iron srilts froin tlic fcrrous to tlic ferric state rcsults in n chniigc in pliysiciil popcrtics of the ink \rliich itial;cs i t tiioro resistant to tlic action of ncicls niitl otlicr rcagcnts. Tlic 1wirn:rry salts nrc ittore rcndily solublc in watcr. TI& csplnitis thc dccrenscd copying powcr of niaturc inks iiotcd by Frazcr.

JIezgcr Rill1 aud IIccse (Zcitscltr. f. nngcw. C~ICIII., 1931, 31, ti45; Ucitriigc X . l i t h Syiipt. u. Tcclin. Arch. fur. l<rittt,, 1933, 92, 107) ltiivc also studictl tlic rcnctiotls of ink ns it tilatiires on paper. Studying tlic Iiydrogcn ioii coiicctitmtiou tlicsc nutliors concludc that tltc iron. scilts nssocintctl with i d i itrr " iwid." Zcteschc (A tin.,

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