When conducting contaminant analysis, it is often the case that the contaminant consists of a mixture of substances. A spectrum search for component mixtures typically requires that the search criteria be changed to identify components other than the principle constituent, and this necessitates some degree of expertise in reading spectra. The Contaminant Analysis Program developed by Shimadzu, as introduced in Application News No. A400, is effective in just such cases. Here, we introduce the contaminant analysis program which is included in the new LabSolutions IR software.