Ceres Gabriele, Conte Valeria, Mirruzzo Valentina, Kolar Jana, Strlic Matija
Dipartimento di Scienze e Tecnologie Chimiche, Università di Roma Tor Vergata, Via della Ricerca Scientifica, 00133 Roma, Italy.
ChemSusChem. 2008;1(11):921-6. doi: 10.1002/cssc.200800111.
Iron gall inks have been known since Roman times, were widely used in the Medieval Age, and became the most used ink in the Renaissance period. They were still officially used by the German Government as recently as 1973. The two main constituents of the ink are tannic acid and ferrous sulfate (vitriol). The vitriol normally used was not very pure and likely contained a mixture of iron sulfate with traces of other metals, in particular, copper. Certain transition-metal ions contained in iron gall inks and their acidity are known to deteriorate paper. Therefore, stabilization treatments consist of deacidification and the addition of antioxidants. To this end, the use of tetraalkylammonium bromides was recently proposed. Here, it is shown that 1-butyl-2,3-dimethylimidazolium bromide both in aqueous and in alcoholic solution can prevent the oxidative deterioration of cellulose. Furthermore, it does not lead to the yellowing of paper nor does it significantly affect the colour of the ink.
铁胆墨水自罗马时代就已为人所知，在中世纪被广泛使用，并在文艺复兴时期成为使用最广泛的墨水。直到1973年，德国政府仍在官方文件中使用它。这种墨水的两种主要成分是单宁酸和硫酸亚铁（绿矾）。通常使用的绿矾纯度不高，可能含有硫酸铁与微量其他金属（特别是铜）的混合物。已知铁胆墨水中含有的某些过渡金属离子及其酸度会使纸张变质。因此，稳定化处理包括脱酸和添加抗氧化剂。为此，最近有人提出使用四烷基溴化铵。在此表明，1-丁基-2,3-二甲基咪唑溴化物在水溶液和醇溶液中都能防止纤维素的氧化变质。此外，它不会导致纸张变黄，也不会显著影响墨水的颜色。
