Fluoran is a triarylmethane dye. It is the structural core of a variety of other dyes.^[1]

Quick Facts Names, Identifiers ...

Fluoran

Names
Preferred IUPAC name 3H-Spiro[[2]benzofuran-1,9′-xanthen]-3-one
Identifiers
CAS Number	596-24-7 Y
3D model (JSmol)	Interactive image
ChEBI	CHEBI:37915 Y
ChemSpider	62216 Y
ECHA InfoCard	100.008.984
PubChem CID	68994
UNII	C8A6LHH76W Y
CompTox Dashboard (EPA)	DTXSID50208276
InChI InChI=1S/C20H12O3/c21-19-13-7-1-2-8-14(13)20(23-19)15-9-3-5-11-17(15)22-18-12-6-4-10-16(18)20/h1-12H Y Key: FWQHNLCNFPYBCA-UHFFFAOYSA-N Y InChI=1/C20H12O3/c21-19-13-7-1-2-8-14(13)20(23-19)15-9-3-5-11-17(15)22-18-12-6-4-10-16(18)20/h1-12H Key: FWQHNLCNFPYBCA-UHFFFAOYAD
SMILES O=C2OC4(c1ccccc12)c5ccccc5Oc3ccccc34
Properties
Chemical formula	C20H12O3
Molar mass	300.31
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Y verify (what is YN ?) Infobox references

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These dyes have a variety of applications such as chemical stains (for example eosins) and in thermal paper. Black 305 is a common leuco dye product for thermal paper.^[2]