[Determination of the sequencing of sealing and writing with Fourier IR microscopic chemical image system].

Using Fourier-transform IR microscopic chemical image system, combined with surface scan and reflection mode, non-invasive fast identification of the sequencing of writing and sealing was carried out. Results indicate that sealing prior to writing leads to evident characteristic peaks of the ink in the IR spectra, while writing prior to sealing results in clear characteristic peaks of the stamp-pad ink in the IR spectra. The method features speediness, exactness, impersonality, and non-invasion to the sample.