Description
Brilliant Blue FCF (C.I. 42090) is a synthetic triarylmethane dye supplied for laboratory colourant and staining applications. Registered under CAS number 3844-45-9 and EG number 223-339-8, it has the empirical formula C₃₇H₃₄N₂O₉S₃Na₂ and a molar mass of 792,84 g/mol. The material shows a density of 1,48 g/cm³. Laboratories use Brilliant Blue FCF as a water-soluble blue colourant in analytical chemistry, formulation trials and teaching demonstrations where a defined Colour Index reference is required. The disodium sulfonate structure confers good aqueous solubility, supporting preparation of stock solutions for dye-binding assays, tracer studies and visual marking tasks. Consistent molecular identity and documented physical data help ensure batch-to-batch comparability in method development. The compact glass packaging protects the solid dye during handling and dispensing while suiting small- to medium-scale experimental demand in research and quality-control settings.
This article is part of Microscopy stains & staining solutions, in Dyes, stains & indicators.
Key features
- Appearance: dark blue to purple powder or granules
- In H2O insoluble matter: ≤1 %
- Loss on drying (135 °C): ≤13 %
- CAS number: 3844-45-9
- Pack sizes: 10 g, 25 g, 100 g, 1 kg
- EG nr.: 223-339-8
- Empirical formula: C₃₇H₃₄N₂O₉S₃Na₂
- Molar mass: 792,84 g/mol
- Density: 1,48 g/cm³
- Technical Information Sheet:
- Safety Data Sheet:
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Questions about Brilliant Blue FCF (C.I. 42090), 10 g, glass
What is this article?
Brilliant Blue FCF (C.I. 42090), 10 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.