The eosin-nigrosin staining technique is based on the principle that dead cells will take up the eosin and as a result stain red. The nigrosin provides a dark background which makes it easier to assess the slides. The VitalScreen is based on the test procedure described in the WHO laboratory manual (2010).
VitalScreen has a 24 month shelf life from production date. Information about the composition of the product can be found in the material safety data sheet.