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3-(2-Pyridyl)-5,6-di(2-furyl)-1,2,4-triazine-5′,5′′-disulfonic acid disodium salt, also known as Ferene, is commonly used to measure the concentration of iron ions in aqueous solutions. The reagent is sensitive to ferrous iron ions (Fe2+) and forms a purple-colored complex with these ions in the presence of a reducing agent. The intensity of the purple color formed is proportional to the concentration of iron ions present in a solution and is quantified spectrophotometrically.

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4-(2-Pyridylazo)resorcinol (PAR) is a monosodium salt(1), dibasic acid that forms the protonated complexes with most metal ions.

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It is used for the preparation of electrically conducting glasses. Used to make solutions for the separation of RNA from DNA by density gradient centrifugation.

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Toluidine blue (C.l. 52040) is a diaminothiazine dye. It is also known as TBO, tolonium chloride, and toluidine blue O.

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Rhodamine 110 chloride (R110) is a laser grade dye. It has been used for the synthesis of the rhodamine 110 octadecyl ester (R110C18).

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3,3′-Diaminobenzidine tetrahydrochloride hydrate has been used in immunohistological staining procedure and in situ hybridisation. DAB (3,3′-Diaminobenzidine) is utilised in many applications for the visualisation of peroxidase activity. In the peroxidase reaction, DAB serves as a hydrogen donor in the presence of peroxide. The oxidised DAB forms an insoluble brown end-product for use in immunohistological and immunoblotting staining procedures.

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Alcian Blue solution has been used in the histological staining of acidic glycosaminoglycans (GAGs; mucopolysaccharides) that are carboxylated or sulfated. Sulfated glycosaminoglycans appear to be the preferred substrate for alcian blue at pH 2.5. Alcian blue has been used to stain hyaluronan (HA), a nonsulfated GAG, but the intensity of the staining of HA is affected by the method of tissue fixation used. Alcian blue staining of GAGs in tissue may be modified through the addition of an electrolyte such as magnesium chloride.

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Methylene blue, Neisser formulation. Well developed granules of volutin (polyphosphate) may be seen in unstained wet preparations as round refractive bodies within the bacterial cytoplasm. With methylene blue they stain metachromatically, a reddish purple color.

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Chicago Sky Blue 6B is a counterstain for background autofluorescence in fluorescence and immunofluorescence histochemistry. It has also been used as a filling in glass pipette electrodes for electrophysiological recordings in the brain sections of rats.

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10-(2',4'-Dinitrophenylazo)-9-phenanthrol, (DNAF)

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Phycobiliprotein exhibiting exceptional absorbance and fluorescence characteristics due to a lack of susceptibility to internal and external fluorescence quenching. Ideal for highly sensitive studies in flow cytometry and immunoassays.

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Suitable for titration of morpholine

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Brilliant green ≥90% (dye content), certified by the Biological Stain Commission, Sigma-Aldrich®

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Brilliant Blue R (C.l. 42660) is a triaminotriarylmethane dye with two amino groups being benzylated and one phenylated. It is also known as brilliant indocyanine 6B and coomassie blue R250. Brilliant Blue R has been widely used for protein band detection after SDS-PAGE (sodium dodecyl sulfate-polyacrylamide gel electrophoresis).

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Fast green FCF, Sigma-Aldrich®

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Trypan Blue (C.l. 23850) is a large, tetrasulfonated anionic, hydrophilic dye. It is also known as diamine blue 3B. Trypan blue has been used as a dye in trypan blue exclusion assay/cell viability assay to detect dead cells.

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Proflavine is a small, amphipathic, acridine-derived fluorescent dye.Proflavine hemisulfate is used as a rapid stain for cytological studies of biological specimens. It stains cytoplasmic structures and nuclei. Proflavine has the capability to intercalate double stranded DNA.

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Anthrone, also known as 9(10H)-Anthracenone, is a planar tricyclic aromatic ketone. In acidic conditions, anthrone reacts with carbohydrate to yield a blue-green colour.

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2,7,12,17-Tetra-tert-butyl-5,10,15,20-tetraaza-21H,23H-porphine has been used in multifunctional drug delivery investigations from ionic triblock terpolymer micelles.

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For use with Osteo-bed bone embedding kit. Solvent for removal of plastic from sections prior to rehydration and staining. Most histochemical and immunohistochemistry staining protocols require the removal of methyl methacrylate (MMA) and rehydration of mounted sections for improved stain penetration and greater contrast.

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Nigrosin,certified by the Biological Stain Commission (Acid black 2; Nigrosin water soluble).

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Thioflavin T is a benzothiazole dye that increases in fluorescence upon binding to amyloid. Thioflavin T has been used in histology and for protein characterization.

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Intended for use in the Leukocyte Acid Phosphatase procedure, procedure No. 386 or 387

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Crystal Violet lactone, Dye content 97%.

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Carbazole is an aromatic heterocyclic organic molecule.

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Violamine R 60% (dye content), Sigma-Aldrich®

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Oil Red EGN has been used to stain lipid droplets accumulated in cell during adipogenesis.

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Silver stain is an aid in distinguishing fungi, basement membrane and opportunistic organisms such as Pneumocystis carinii in tissue sections or smears.

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4-(4-Isothiocyanatophenylazo)-N,N-dimethylaniline,97% (4-(Dimethylamino)azobenzene-4'-isothiocyanate; DABITC)

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Metachromatic dye