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Sudan III is a lysochrome (fat-soluble) azo dye widely used as a biological stain for lipids, fats, and oils. It is a lipophilic dye, meaning it preferentially dissolves in fats and hydrophobic structures, producing a bright red-orange coloration. Sudan III is commonly used in histology, microbiology, and food testing to detect lipid content.

Azure II–Eosinate is a complex salt of Azure II (a thiazine dye) with Eosin (an acidic dye), widely used in hematology, histology, and cytology as a biological stain. It is best known as a key component of the Romanowsky-type staining methods, commonly applied in blood smear and bone marrow staining.

Wright's Stain is a polychromatic stain used primarily in hematology to differentiate blood cell types in peripheral blood smears and bone marrow aspirates. It is a variant of the Romanowsky stains.

Calcein, also known as Fluorescein Complexone, is a fluorescent metal ion indicator and biological stain. It is derived from the fluorescein family and exhibits intense green fluorescence under UV or blue light. It has strong affinity for calcium, magnesium, and other divalent cations, which alters its fluorescence properties, making it highly valuable in biological imaging, calcium assays, and complexometric titrations.

O-Cresol Phthalein Complexone (OCPC) is a metal ion indicator dye widely used in analytical chemistry and clinical biochemistry. It belongs to the phthalein dye family and forms intensely colored complexes with calcium, magnesium, and other divalent cations, making it highly valuable in complexometric titrations and colorimetric assays.

Pararosaniline Hydrochloride is a triphenylmethane dye used as a stain and analytical indicator in laboratories. It provides vivid red to magenta coloration and is water-soluble, making it effective for staining biological tissues, microorganisms, or as a pH/chemical indicator. In analytical chemistry, it is commonly used in titrations and metal ion detection due to its color change properties.

Bromophenol Red is a triphenylmethane-based pH indicator dye commonly used in analytical chemistry, biological staining, and laboratory experiments. It exhibits distinct color changes in acidic to slightly acidic conditions, making it suitable for titrations and pH monitoring.