Description
Sudan II (C.I. 12140) is a lipophilic azo dye supplied for microscopy, identified by CAS number 3118-97-6 and the empirical formula C₁₈H₁₆N₂O. With a molar mass of 276,34 g/mol, a density of 0,47 g/cm³, a flash point of 213,6 °C and a boiling point of 300 °C, it offers well-defined physicochemical data for laboratory staining work. The dye is Sudan II belongs to the classic Sudan series of fat-soluble colourants used to highlight neutral lipids and related structures in fixed specimens. This grade from manufacturer Carl ROTH is intended for microscopy applications where consistent dye identity and documented physical constants support reproducible preparation of staining solutions. Laboratories can integrate the material into established fat-staining workflows, microtechnique teaching sets, or method development that relies on C.I. 12140. The compact glass pack supports controlled dispensing and storage within standard chemical inventories for dyes and pigments used in biological imaging.
This article belongs on Microscopy stains & staining solutions, in Dyes, stains & indicators.
Key features
- Appearance: orange red powder
- Appearance of solution (1 % in CHCl3): orange to red
- CAS number: 3118-97-6
- Pack sizes: 5 g, 25 g, 100 g
- Empirical formula: C₁₈H₁₆N₂O
- Molar mass: 276,34 g/mol
- Density: 0,47 g/cm³
- 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 Sudan II (C.I. 12140), for microscopy, 5 g, glass
What is this article?
Sudan II (C.I. 12140), 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 Produits chimiques de laboratoire et industriels.
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.
Which category should I open next?
The category is Dyes, stains & indicators. The sub-category is Microscopy stains & staining solutions. The catalogue is Produits chimiques de laboratoire et industriels.
Shelves beside this one are Fluorescent dyes & labels and Dyes & pigments.
What should I check before I order?
The technical information on this page is the manufacturer's sheet. Read that, not a rewritten specification.
When this page shows a safety data sheet, use that manufacturer file. Hazard text does not belong in the sales description. For a pack size, a grade or a certificate that is not on the page, send a quote request or contact the team.
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The seven catalogues are Labware, Lab chemicals, Lab instruments, Lab consumables, Chromatography equipment, Lab safety equipment and Life Science & Microbiology.