Naphthol Green B

Naphthol Green B^[1]
Names
	IUPAC name trisodium; iron(3+); 5-nitroso-6-oxidonaphthalene-2-sulfonate
	Other names Acid Green 1; C.I. 10020
Identifiers
CAS Number	19381-50-1 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:87073 ;
ECHA InfoCard	100.039.085
PubChem CID	6915910;
	SMILES C1=CC2=C(C=CC(=C2N=O)[O-])C=C1S(=O)(=O)[O-].C1=CC2=C(C=CC(=C2N=O)[O-])C=C1S(=O)(=O)[O-].C1=CC2=C(C=CC(=C2N=O)[O-])C=C1S(=O)(=O)[O-].[Na+].[Na+].[Na+].[Fe+3];
Properties
Chemical formula	C30H15FeN3Na3O15S3
Molar mass	878.45 g·mol−1
Hazards
S-phrases (outdated)	S22 S24/25
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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	Infobox references

Naphthol Green B is a green nitroso dye.

Chemistry

Naphthol Green B is the sodium salt of Naphthol Green Y (C.I. 10005). Its absorption maximum is 714 nm in water.^[2] It is water-soluble.

Naphthol Green B is used in histology to stain collagen.^[3] Moreover, it is used for polychrome stains with animal tissue. For industry purposes Naphthol Green B is used for staining wool, nylon, paper, anoxidized aluminium and soap.^[2]

↑ Naphthol Green B at Sigma-Aldrich
1 2 Horobin, RW. und Kiernan, JA. (2002): Conn's Biological Stains: A Handbook of Dyes, Stains and Fluorochromes for Use in Biology and Medicine. BIOS Scientific Publ., 10th edition; ISBN 1-85996-099-5; page 101 and 102
↑ Histological and Histochemical Methods: Theory and Practice, 4th edition, J. A. Kiernan

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