Description
Sudan orange G (C.I. 11920) is an orange azo dye for microscopy, registered under CAS number 2051-85-6 with the empirical formula C₁₂H₁₀N₂O₂. Key physical data include a molar mass of 214,22 g/mol, a density of 1,24 g/cm³ and a boiling point of 407,5 °C, giving clear reference values for solution preparation and handling. As a member of the Sudan dye family used in dyes for biological applications, it supports fat staining and comparative colouration work alongside other lipophilic colourants. Material from manufacturer Carl ROTH is offered specifically for microscopy, helping laboratories maintain consistent dye lots for routine histology, teaching preparations, or method optimisation. The glass pack format suits small-scale weighing and stock solution work in research and diagnostic support laboratories that rely on C.I. 11920. Documented molar mass and density facilitate calculation of working concentrations without additional compositional assumptions beyond the stated identity.
This article is part of Microscopy stains & staining solutions, in Dyes, stains & indicators.
Key features
- Appearance: orange red powder
- CAS number: 2051-85-6
- Pack sizes: 5 g, 25 g, 100 g
- Empirical formula: C₁₂H₁₀N₂O₂
- Molar mass: 214,22 g/mol
- Density: 1,24 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 orange G (C.I. 11920), for microscopy, 5 g, glass
What is this article?
Sudan orange G (C.I. 11920), 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.
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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The seven catalogues are Labware, Lab chemicals, Lab instruments, Lab consumables, Chromatography equipment, Lab safety equipment and Life Science & Microbiology.