Specialty chromatographs and accessories are specialized or proprietary products related to chromatography and chromatography instruments. Chromatography is an analytical technique used in the chemical separation of mixtures and substances. It depends on the differential distribution of a solute between mobile and stationary phases. As the solute passes through the stationary phase, each constituent of the mixture separates at different speeds. These constituents can then be analyzed with chromatography instruments such as chromatograms, chromatographs, and ultra low pressure calibration devices. The proper selection of specialty chromatographs and accessories requires an analysis of product specifications and capabilities. Typically, a specialty chromatograph is used to perform chromatographic separation and to produce a specialty chromatogram, the pattern of bands of substances separated by a chromatograph column. Suppliers of specialty chromatographs and accessories are located across the United States and around the world.