Description
Sudan IV (C.I. 26105) is a lipophilic azo dye intended for microscopy, with CAS number 85-83-6 and empirical formula C₂₄H₂₀N₄O. It has a molar mass of 380,45 g/mol and a density of 1,331 g/cm³, together with a flash point above 289 °C and a boiling point above 238 °C, supporting controlled use in staining workflows. This grade is Available from manufacturer Carl ROTH, the dye is further identified by EG number 201-635-8, aiding catalogue matching and inventory control. Sudan IV is commonly applied to visualise lipids and hydrophobic structures in biological specimens and for microscopy-oriented staining protocols where a defined Colour Index dye is specified. Clear physical and identity data help laboratories integrate the reagent into established staining schemes and maintain reproducible contrast. The microscopy-focused presentation suits routine and specialised biological dye applications without unrelated performance claims.
This article belongs on Microscopy stains & staining solutions, in Dyes, stains & indicators.
Key features
- Appearance: dark-red powder
- Maximum absorption: 519-523 nm
- CAS number: 85-83-6
- Pack sizes: 25 g, 50 g
- EG nr.: 201-635-8
- Molar mass: 380,45 g/mol
- Density: 1,331 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 IV (C.I. 26105), for microscopy, 25 g, glass
What is this article?
Sudan IV (C.I. 26105), for microscopy, 25 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.
Which category should I open next?
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.
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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Which other categories should I open?
The seven catalogues are Labware, Lab chemicals, Lab instruments, Lab consumables, Chromatography equipment, Lab safety equipment and Life Science & Microbiology.