Chemical characteristics of pigment colorant of Quercus infectoria

An iron-gall ink is made with the tannin extracts (colorant components) from Quercus infectoria and is observed using UV-Vis spectroscopy and was analysed with Fourier transform infrared spectroscopy (FTIR). The aim of the study was to investigate the method of extracting the gallotannic acid from Quercus infectoria together with the production of iron-gall ink and characterized its properties. The UVVis analysis was successful in characterizing the ink and the maximum absorbance is obtained, whereas the FTIR analysis revealed the peaks of functional groups that presents in the ink. The UV-Vis spectroscopy analysis shows the presence of the highest peak at 328 nm, close to the spectrum of violet (400 nm). UV-Vis spectral data were mainly produced by the colorant components (i.e., dyes) found in the ink. While the FTIR data shows a broad peak at 3293 cm -1, indicating the presence of -OH stretch and also there is a presence of aromatic compound.