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DTA were added to the buffer solution to ensure stability of the formed complexes during the CE run in the capillary and to maintain the metal ions in their original oxidation state. Finally, two kinds of iron gall ink samples were tested to evaluate the applicability of the developed method. The Fe(Ⅱ)/Fe(Ⅲ) ratios of ink sample 1 and ink sample 2 changed from 1.79 to 0.45 and from 2.67 to 0.3, respectively, from the 1st day to the 75th day after writing. The results demonstrate that the developed method can be used to highlight fraudulent
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