Biebrich scarlet

Biebrich scarlet
Names
	IUPAC name 2-[(2Z)-2-(2-oxonaphthalen-1-ylidene)hydrazinyl]-5-(4-sulfophenyl)diazenyl-benzenesulfonic acid
	Other names Croceine scarlet; C.I. 26905
Identifiers
CAS Number	25317-38-8 ; (Sodium salt): 4196-99-0;
3D model (JSmol)	Interactive image; (Sodium salt): Interactive image;
ChemSpider	4757734 ;
ECHA InfoCard	100.021.895
EC Number	224-084-5;
MeSH	Biebrich+scarlet
PubChem CID	20171; (Sodium salt): 20170;
CompTox Dashboard (EPA)	DTXSID2063345 ;
	InChI InChI=1S/C22H16N4O7S2/c27-20-12-5-14-3-1-2-4-18(14)22(20)26-25-19-11-8-16(13-21(19)35(31,32)33)24-23-15-6-9-17(10-7-15)34(28,29)30/h1-13,25H,(H,28,29,30)(H,31,32,33)/b24-23+,26-22- Key: VJULFVPZZZJPDJ-PUNVMFJJSA-N ; InChI=1/C22H16N4O7S2/c27-20-12-5-14-3-1-2-4-18(14)22(20)26-25-19-11-8-16(13-21(19)35(31,32)33)24-23-15-6-9-17(10-7-15)34(28,29)30/h1-13,25H,(H,28,29,30)(H,31,32,33)/b24-23+,26-22- Key: VJULFVPZZZJPDJ-PUNVMFJJBJ; (Sodium salt): InChI=1/C22H16N4O7S2.2Na/c27-20-12-5-14-3-1-2-4-18(14)22(20)26-25-19-11-8-16(13-21(19)35(31,32)33)24-23-15-6-9-17(10-7-15)34(28,29)30;;/h1-13,27H,(H,28,29,30)(H,31,32,33);;/q;2*+1/p-2 Key: VVAVKBBTPWYADW-NUQVWONBAJ;
	SMILES O=S(=O)(O)c4ccc(/N=N/c1ccc(c(c1)S(=O)(=O)O)N/N=C2/c3ccccc3\C=C/C2=O)cc4; (Sodium salt): [Na+].[Na+].[O-]S(=O)(=O)c1ccc(cc1)/N=N/c4ccc(/N=N/c2c3ccccc3ccc2O)c(c4)S([O-])(=O)=O;
Properties
Chemical formula	C22H16N4O7S2
Molar mass	512.51 g·mol−1
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H302, H312, H315, H319, H332, H335
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Biebrich scarlet (C.I. 26905) is a molecule used in Lillie's trichrome. It is an anionic mono-azo dye, which is an important pigmenting agent in the textile and paper industries, used to color wool, silk, cotton, and papers. The dye was created in 1878 by the German chemist Rudolf Nietzki. He was employed by Kalle & Co. and completed his contributions on August of 1880, where he claimed to be the inventor of Biebrich scarlet. The name, Biebrich scarlet, originated from the location where a company, Kalle & Co., marketed the dye in Biebrich (Wiesbaden).