Papanicolaou's solution Orange G (OG-6) solution 2.5L. Medil's Papanicolaou's Orange G (OG-6) 2.5L 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. The effect of the orange staining solution is significant in smears with keratinized cells under acidic pH conditions, when the obvious orangeophilic cytoplasmic staining is recognizable and may indicate the presence of hyperkeratosis, HPV infection or carcinoma cells. Medil's Papanicolaou's solution Orange G (OG-6) 2.5L stain gives an intense yellow-orange staining result with mature and keratinized squamous cells. Papanicolaou's solution 2b, Orange II solution gives an intense reddish result with mature and keratinized squamous cells. A 500ml bottle is sufficient for 1500-2000 stains. Medil's Papanicolaou's solution Orange G (OG-6) 2.5L stain is an IVD approved and CE certified product, so it can be used for clinical diagnostic purposes.