Elucidation of the Fe(III) Gallate Structure in Historical Iron Gall Ink

作者：Ponce Aldo; Brostoff Lynn B^*; Gibbons Sarah K; Zavalij Peter; Viragh Carol; Hooper Joseph; Alnemrat Sufian; Gaskell Karen J^*; Eichhorn Bryan^*

来源：Analytical Chemistry, 2016, 88(10): 5152-5158.

DOI：10.1021/acs.analchem.6b00088

Synthetic, structural, spectroscopic and aging studies conclusively show that the main colorant of historical iron gall ink (IGI) is an amorphous form of Fe(III) gallate. xH(2)O (x = similar to 1.5-3.2). Comparisons between experimental samples and historical documents, including an 18th century hand-written manuscript by George Washington, by IR and Raman spectroscopy, XRD, X-ray photoelectron spectroscopy, and Mossbauer spectroscopy confirm the relationship between the model and authentic samples. These studies settle controversy in the cultural heritage field, where an alternative structure for Fe(III) gallate has been commonly cited.

• 出版日期2016-5-17