Papanicolaou's solution EA 50 4lt Hematoxylin solution - Medil. Packaging: 4-liter container. Polychromatic solution EA 50 (3b) which is used to demonstrate the differentiation of squamous cells in gynecological cytology. Medil's Papanicolaou's solution 3b polychromatic solution EA 50 4L stain for cytological cancer diagnosis. The cytological staining technique developed by Papanicolaou continues to be the standard method for cancer diagnosis and hormone cycle diagnosis. In the final staining stage, the polychromatic solution is used, a mixture of eosin, light green SF, and Bismarck brown. The polychromatic solution is used to demonstrate the differentiation of squamous cells. It is an IVD product and CE certified.