Leucomethylene blue mesylate (TRx0237 mesylate) is a second-generation tau protein aggregation inhibitor for the treatment of Alzheimer's disease (AD) and frontotemporal dementia.

Ninhydrin is a chromogenic analytical probe for the quantification of proteins and amino acids.

Direct Violet 1 (CCRIS 2413) is an agent of dye.

DAOS (Sodium 3-((3,5-dimethoxyphenyl)(ethyl)amino)-2-hydroxypropane-1-sulfonate),Trinder's reagent, is a new type of highly water-soluble aniline derivative. It is widely used in diagnostic tests and biochemical tests.

Bathophenanthroline is a compound used for the measurement of iron concentrations in aqueous, urine, and serum samples by colorimetry.

ADPS (N-Ethyl-N-(3-sulfopropyl)-3-methoxyaniline sodium salt) is a kind of new Trinder's reagents, which are high water-soluble aniline derivatives. It is widely used in diagnostic and biochemical tests.

ADOS (82692-96-4) is a biochemical and chromogenic reagent.

MAOS is a novel Trinder reagent that is a colorimetric probe.

Blue Tetrazolium (Tetrazolium blue), a dye used in microbial research, can be reduced to blue tetrazolium formazan (BTF). It determines succinate dehydrogenase (SDH) activity in yeast strains as a reduced substrate. Extract BTF using DMSO and test its absorption spectrum. BTF exhibits a wavelength range of 480-600 nm with maximal absorbance at 540 nm [1].

Fast Sulphon Black F serves as a specific copper indicator and is applicable for EDTA titration [1].

C.I. 18760 is a dye in the form of a bluish red powder. Its aqueous solution is yellowish to brownish red, turning reddish orange with dilute sulphuric acid; with concentrated caustic soda it turns brilliant red. In concentrated sulfuric acid is rose red, diluted to orange; in concentrated nitric acid the color disappears. It is used for dyeing and printing of wool, silk and its fabrics, also can dye nylon and its blended fabrics.

2,6-Dibromoquinone-4-chloroimide is a colorimetric dye for the detection of phenolic compounds. It produces an indigo dye upon reacting with phenolic compounds at a pH of approximately 9.4. 2,6-Dibromoquinone-4-chloroimide has been used as a Gibbs reagent for the colorimetric detection of phenolic compounds. It has also been used in chromogenic reactions for the quantitative colorimetric detection of aflatoxins, causing colorless aflatoxins to become green with an absorption band at 673 nm.

Chlorophosphonazo mA (CPA-mA) forms a blue complex with rare earth elements in an acidic medium. It is utilized in the determination of rare earth elements.

Fast Blue B Salt, a fat-soluble and phenolic compound-binding dye, serves for semi-quantitative analysis of alkylresorcinols in rye and forms a colored precipitate upon acetone exposure [1]. It also demonstrates affinity for diazonium compounds.

Bromopyrogallol Red (Dibromopyrogallolsulfonphthaleine) serves as a versatile dye, widely utilized across traditional and emerging sectors. In biological experiments, it facilitates the observation and analysis of cell structures, tracking of biomolecules, evaluation of cell functions, differentiation of cell types, detection of biomolecules, examination of tissue pathology, and monitoring of microorganisms. Its uses extend from fundamental scientific research to a broad spectrum of clinical diagnostics. Beyond biology, Bromopyrogallol Red finds application in the textile industry for dyeing and functional textile processing, as well as in the production of food pigments and dye-sensitized solar cells.

Hoffman's violet is specific stains for animal chromosomes. Iodinated alcohol after staining can be substituted with various acids, both organic as well as inorganic, all of which act as trapping agent preventing leaching of the dye that binds with the ch

Diantipyrylmethane is a chromogenic agent frequently utilized in spectrophotometry and extraction photometry to determine metals like Au(III), Ti(IV), Ir, Fe(III), Mo, Nd, U(IV), Ir, Pt, and Re. It is a type of biological material or organic compound extensively employed in life science research.

NaBiO3 is a strong oxidizing agent and can also be used as a color-developing reagent for detecting catecholamine drugs.

C.I. Basic Orange 22 is a basic orange dye.

Acridine yellow G is a versatile dye used extensively in biological research. It aids scientists in visualizing and analyzing cell structures, tracking biomolecules, assessing cell functions, identifying cell types, detecting biomolecules, investigating tissue pathology, and monitoring microorganisms. Its applications span from fundamental scientific studies to clinical diagnostics. Additionally, dyes like Acridine yellow G are prevalent in textile dyeing, functional textile processing, food coloring, and dye-sensitized solar cells.

N-(1-Naphthyl)ethylenediamine dihydrochloride monomethanolate is a reagent commonly used in spectrophotometry for the determination of nitrites and nitrates.

Sar-Pro-Arg-pNA, a chromogenic substrate of α-thrombin, can be used to test α-thrombin activity [1].

Pyr-Pro-Arg-pNA serves as a chromogenic substrate utilized in the determination of protein C .

Bromo-PADAP is a dye agent utilized in research for the spectrophotometric determination of uranium(VI). This compound exhibits high sensitivity to uranium, with a molar absorptivity of its uranyl complex at 74,000 at 578 nm and pH 7.6. In the presence of mixed masking solutions, only a few ions cause significant interference. By initially extracting uranium into trioctylphosphine oxide and subsequently developing the Bromo-PADAP color in the organic phase, the method becomes specifically targeted to uranium. Detailed procedures for the determination of uranium in water, ores, phosphoric acid and phosphate rocks, thorium oxide, and zirconium oxide are provided in the text.