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Fourier transform infrared spectroscopy (FT-IR) was used to examine 20 batches of the mineral medicine natrii sulfas (NS) to establish its reference point and fingerprint it using the common peak patterns in the spectra of the samples. The correlation coefficient, corner cosine, and peak location averages were then used to evaluate the similarities between the spectra. The fingerprint was verified through cluster analysis of four batches of the mineral medicine. Finally, it was confirmed that fingerprinting is a facile, rapid, and accurate method for the quality control of NS. [ABSTRACT FROM AUTHOR]