Eosin Y

Eosin Y

Names
IUPAC name 2-(2,4,5,7-Tetrabromo-6-oxido-3-oxo-3H-xanthen-9-yl)benzoate [in its deprotonated form]
Other names C.I. 45380 C.I. Acid Red 87 Eosin Yellow
Properties
Chemical formula	C20H6Br4Na2O5
Molar mass	647.89052 g/mol
Appearance	Reddish powder
Density	1.018 g/cm3
Melting point	295.5 °C (563.9 °F; 568.6 K)
Boiling point	(decomposes)
Solubility in water	Slightly soluble
Hazards
Safety data sheet	Sigma-Aldrich
Lethal dose or concentration (LD, LC):
LD50 (Median dose)	2,000 mg/kg (rat, oral)
Related compounds
Related compounds	Fluorescein
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Eosin Y, also called C.I. 45380 or C.I. Acid Red 87, is a member of the triarylmethane dyes.

Properties

Chemical

It is commonly used in histology, most notably in the H&E (Haematoxylin and Eosin) stain.

Physical

Eosin Y is a reddish solid, soluble in organic solvents.

Availability

Eosin Y is sold by chemical suppliers.

Preparation

Can be synthesized by brominating fluorescein.

Projects

• Hystological dye
• Papanicolaou stain

Handling

Safety

The compound doesn't appear to be harmful at low concentrations.

Storage

In closed airtight bottles.

Disposal

Eoxin Y doesn't require any special disposal.

References

Relevant Sciencemadness threads

• H&E Stain