A liver biopsy stained using the<unk>  demonstrating histoplasma (black round balls) in a granuloma. In pathology, the<unk> -Gomori's (or Gömöri)<unk><unk>  stain, abbreviated GMS, is a popular staining method in histology. The stain was originally named after György Gömöri, the Hungarian physician who developed the stain. It is used widely as a screen for fungal organisms. It is particularly useful in staining carbohydrates. It can be used to identify the yeast-like fungus Pneumocystis jiroveci, which causes a form of pneumonia called Pneumocystis pneumonia (PCP) or pneumocystosis. The cell walls of these organisms are outlined by the brown to black stain. The principle of GMS is the reduction of<unk>  ions, which renders the fungal cell wall black. The fungal cell wall commonly contains polysaccharides. In a GMS procedure, chromatin acid is first used to oxidize polysaccharides, generating aldehydes. Then<unk> 's alkaline hexamine-silver solution is applied, where the<unk>  ions are reduced to black amorphous<unk> . The reduction reaction by the fungal cell wall is often known as argentaffin reaction.
Grocott's methenamine silver stain
Auramine phenol stain
Romanowsky stain
Wayson stain
Phosphotungstic acid-haematoxylin stain
Bielschowsky stain
Movat's stain
PAS diastase stain