Carbol fuchsin

Carbol fuchsin
	; Chemical structure of fuchsin
Names
	IUPAC name 4-[(E)-(4-aminophenyl)-(4-imino-3-methylcyclohexa-2,5-dien-1-ylidene)methyl]-2-methylaniline;hydrochloride
	Other names Carbol-Fuchsin
Identifiers
CAS Number	8052-17-3; 4197-24-4;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:87668;
ECHA InfoCard	100.021.897
EC Number	224-086-6;
PubChem CID	5748567;
CompTox Dashboard (EPA)	DTXSID30962122 ;
	InChI InChI=1S/C21H21N3.ClH/c1-13-11-16(5-9-19(13)23)21(15-3-7-18(22)8-4-15)17-6-10-20(24)14(2)12-17;/h3-12,23H,22,24H2,1-2H3;1H/b21-16+,23-19?; Key: HZLHRDBTVSZCBS-UVJJDBRNSA-N;
	SMILES CC1=C/C(=C(\C2=CC=C(C=C2)N)/C3=CC(=C(C=C3)N)C)/C=CC1=N.Cl;
Properties
Chemical formula	C26H25N3O·HCl
Molar mass	351.9 g/mol
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Carbol fuchsin, carbol-fuchsin, carbolfuchsin, or Castellani's paint (CAS 4197-24-4) is a mixture of phenol and basic fuchsin that is used in bacterial staining procedures. It is commonly used in the staining of mycobacteria because it has an affinity for the mycolic acids found in their cell membranes.

It is a component of Ziehl–Neelsen stain, a differential stain. Carbol fuchsin is used as the primary stain dye to detect acid-fast bacteria because it is more soluble in the cells' wall lipids than in the acid alcohol. If the bacteria is acid-fast the bacteria will retain the initial red color of the dye because they are able to resist the destaining by acid alcohol (0.4–1% HCl in 70% EtOH). Additionally, it can be used for the staining of bacterial spores.

Carbol-fuchsin is also used as a topical antiseptic and antifungal.

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