Iron-Gall Ink Corrosion: A Coumpound-Effect Study
| Main Authors: | , , |
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| Format: | Article |
| Language: | English Slovak |
| ISSN: | ISSN 0034-5806 |
| Online Access: | http://www.viks.sk/chk/res_4_00_204_212.doc |
| Abstract: | SUMMARIES. By means of design of experiments (DOE) the role of varying concentrations of the main components in iron-gall ink were investigated. The main components in the inks used were iron(II)sul-phate, tannic acid and gum Arabic. In total 12 different ink compositions were made and plotted as a line on bleached softwood sulphite paper. By applying accelerated ageing and measuring the tensile strength, the contribution of each component towards the accelerated ageing of paper was calculated. It was concluded that all three main components do have an influence on the iron-gall ink corrosion process. This effect can be seen after a period of 3 days accelerated ageing at 90°C and 50% relative humidity. The presence of iron(II)sulphate is dominant in the iron-gall ink corrosion process while tannic acid and gum Arabic are opposing, thus slowing down the deterioration. CONCLUSION. Based on the results obtained, the following conclusions can be drawn: ˙ All three main components do have an influence on the iron-gall ink corrosion process. This effect can be seen after a period of 3 days accelerated ageing. ˙ Iron(II)sulphate is the main cause of the iron-gall ink corrosion process. ˙ The higher the concentration of iron(II)sulphate in the ink, the more iron-gall ink corrosion will take place. ˙ The effects of tannic acid and gum Arabic are opposite, thus slowing down the deterioration. ˙ The above means that the "worst-case ink" is composed by mixing a high level of iron(II)sulphate and low levels of tannic acid and gum Arabic (ink 6). This conclusion is affirmed by the experiments. ˙ No "interaction effects" could be determined by the performed experiments. However it was shown that iron-gall ink corrosion increases when the molar ration iron(II)-tannic acid increases. |
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| ISSN: | ISSN 0034-5806 |
