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Prontosil™ is a family of HPLC columns, manufactured by Bischoff-Chromatography, Germany. The phases are based on high-purity, base-deactivated, spherical silica gel. Many different pore sizes and modifications are available. With the series ProntoSil KromaPlus and ProntoSil Spheribond there are alternatives to Kromasil and Spherisorb available.