Description
Xylidine Ponceau 2R (C.I. 16150) is an azo dye supplied for microscopy applications in biological and histological laboratories. It is identified by CAS number 3761-53-3, with the empirical formula C₁₈H₁₄N₂Na₂O₇S₂ and a molar mass of 480,40 g/mol. This water-soluble red dye is used in staining protocols for tissue sections and cellular structures where contrast and colour stability support microscopic evaluation. The product is Its listing among dyes for biological applications underlines its role in life-science imaging rather than industrial colouration. Available from manufacturer Carl ROTH, Xylidine Ponceau 2R fits standard microscopy staining procedures when dissolved and applied according to established methods. Documented CAS, formula and molar mass assist correct reagent selection, solution preparation and laboratory record-keeping. offers a practical balance between sufficient material for multiple staining batches and controlled inventory for research or diagnostic support laboratories.
This article is part of Microscopy stains & staining solutions, in Dyes, stains & indicators.
Key features
- Appearance: red powder
- Appearance of solution (0,1 % in H2O): clear, red
- Loss on drying (1 h, 110 °C): ≤5 %
- CAS number: 3761-53-3
- Pack sizes: 5 g, 25 g, 100 g
- Empirical formula: C₁₈H₁₄N₂Na₂O₇S₂
- Molar mass: 480,40 g/mol
- Technical Information Sheet:
- Safety Data Sheet:
Compliance & Safety Information
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Hazard Statements (H-Phrases)
Precautionary Statements (P-Phrases)
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Questions about Xylidine Ponceau 2R (C.I. 16150), for microscopy, 5 g, glass
What is this article?
Xylidine Ponceau 2R (C.I. 16150), for microscopy, 5 g, glass is the article on this page. Luminix Health distributes Carl Roth for laboratory use. It sits in Microscopy stains & staining solutions, inside Dyes, stains & indicators, in Lab chemicals.
A microscopy stain binds a structure so it can be seen: haematoxylin on nuclei, eosin on cytoplasm, Gram reagents on a bacterial wall. A ready solution and a dry dye to be dissolved are different articles. The method names the stain. A substitute dye is a different method.
A dye or a stain binds, or changes colour, so that something invisible becomes visible. An indicator changes at a pH or a redox point. A fluorescent dye absorbs one wavelength and emits another, which is how a microscope or a plate reader picks it out. The excitation and emission, or the transition interval, are the specification. The colour name on the label is not. Structures are on PubChem under IUPAC names. Methods are in the PubMed literature.
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The category is Dyes, stains & indicators. The sub-category is Microscopy stains & staining solutions. The catalogue is Lab chemicals.
Shelves beside this one are Fluorescent dyes & labels and Dyes & pigments.
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