Bismuth-Sulfite-NPS are used for the detection and isolation of Salmonella sp. The formulation is acc. to Wilson and Blair, modified. Both brilliant green and bismuth inhibit the growth of accompanying bacteria. Colonies of Salmonella, which are able to produce H2S are black because of the formation of iron sulfide. Due to the reduction of bismuth ions to metallic bismuth the colonies get a metallic halo. The medium is manufactured and quality tested in compliance with ISO 11133:2014 standard.