Description
Sudan I (C.I. 12055) is an extra pure azo dye reagent supplied for laboratory chemical work, identified by CAS number 842-07-9 and EG nr. 212-668-2. Its empirical formula is C₁₆H₁₂N₂O with a molar mass of 248,28 g/mol, giving a clearly defined molecular identity for analytical and preparative use. This grade is intended where a well-characterised colourant of known composition is required in research or quality-control settings. The material is Physical handling benefits from the glass container, which supports secure storage and straightforward dispensing in the laboratory. Sudan I (C.I. 12055) from manufacturer Carl ROTH combines documented purity designation with transparent compositional data, supporting reproducible workflows. Laboratories can integrate the reagent into dye-related procedures, staining protocols, or comparative colour chemistry while relying on the stated CAS, EG, and molar-mass values.
This article is part of Microscopy stains & staining solutions, in Dyes, stains & indicators.
Key features
- Appearance: orange red to brown powder
- 1. Absorption max. (C2H5OH): 410-425 nm
- 2. Absorption max. (C2H5OH): 470-485 nm
- CAS number: 842-07-9
- Pack sizes: 25 g, 100 g
- EG nr.: 212-668-2
- Empirical formula: C₁₆H₁₂N₂O
- Molar mass: 248,28 g/mol
- Technical Information Sheet:
- Safety Data Sheet:
Compliance & Safety Information
Warning
Hazard Statements (H-Phrases)
Precautionary Statements (P-Phrases)
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Questions about Sudan I (C.I. 12055), extra pure, 25 g, glass
What is this article?
Sudan I (C.I. 12055), extra pure, 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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The seven catalogues are Labware, Lab chemicals, Lab instruments, Lab consumables, Chromatography equipment, Lab safety equipment and Life Science & Microbiology.