Description
Eosin Y (C.I. 45380), for microscopy, is a xanthene dye with empirical formula C₂₀H₆Br₄Na₂O₅ and CAS number 17372-87-1. It has a molar mass of 691,86 g/mol, a density of 0,78 g/cm³ and EG number 241-409-6. Eosin Y serves as a counterstain that colours cytoplasmic and extracellular components, complementing nuclear dyes in routine tissue examination. Analytical and indicator applications also benefit from its defined colour index designation C.I. 45380. Physical data including molar mass and density support accurate solution preparation and laboratory documentation. provides a substantial working quantity for teaching laboratories, pathology workflows and research histology. Clear CAS and EG identifiers facilitate inventory control and regulatory record-keeping. Professional users in microscopy, pathology and analytical chemistry can integrate this Eosin Y into established staining procedures with confidence in the stated identity and physical specifications.
This article is part of Microscopy stains & staining solutions, in Dyes, stains & indicators.
Key features
- Maximum absorption: 510-520 nm
- Solubility: in alcohol and water
- CAS number: 17372-87-1
- Pack sizes: 50 g, 100 g, 500 g
- Empirical formula: C₂₀H₆Br₄Na₂O₅
- Molar mass: 691,86 g/mol
- Grade: For microscopy
- Technical Information Sheet:
- Safety Data Sheet:
Compliance & Safety Information
WarningHazard Statements (H-Phrases)
Precautionary Statements (P-Phrases)
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Questions about Eosin Y (C.I. 45380), for microscopy, 50 g, glass
What is this article?
Eosin Y (C.I. 45380), for microscopy, 50 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.