Orange G excellent quality manufacturer,exporter and supplier. Orange G is a synthetic azo dye used in histology in many staining formulations. It usually comes as a disodium salt. It has the appearance of orange crystals or powder. The main use of Orange G is in the OG-6 Papanicolaou stain, to stain keratin, however it is also a major component of the Alexander test for pollen staining. It is often combined with other yellow dyes and used to stain erythrocytes in the trichrome methods.