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Table 1 Total areas of the Mössbauer spectra of the studied specimens

From: Mössbauer study of iron gall inks on historical documents

Document Absorber thickness mg/cm2 Total area at RT Iron content mg/g Total area at 4.2 K Iron content mg/g Surface pH
Chancery MS total 545 0.038 3.6 0.112 6.0 4.2–3.9
Chancery MS paper only 240 0.0031 0.44 0.0029 0.50 4.8
Latin MS paper with ink 219 0.037 8.8 0.11 21 4.8
Latin MS paper only 386 0.0081 1.1 0.012 1.2 5.3
Cookbook total 53 pages 360 0.014 2.0
Cookbook total 121 layers 825 0.016 1.0 0.037 1.7 4.9
Cookbook paper only 88 layers 600 0.0017 0.15 0.0011 0.07 5.7
  1. The iron contents were estimated from the intensities of the Mössbauer spectra as described in the text. The smaller values for the iron contents obtained from the RT spectra compared to those from the 4.2 K spectra are attributed to the decrease of the Lamb-Mössbauer factor with increasing temperature. In the last column the surface pH values of spots with ink and, for the papers only, of spots without ink are given