9-Phenyl-2,3,7-trihydroxy-6-fluorone
9-Phenyl-2,3,7-trihydroxy-6-fluorone (CAS 975-17-7), also known as Fluorone Black, is a specialized organic compound with the empirical formula C19H12O5 and a molecular weight of 320.30 g/mol. This iron mordant metachrome dye exhibits an absorption maximum at 552 nm. Its primary applications lie within scientific research, particularly in staining procedures within cell biology, hematology, and histology laboratories.
- IUPAC
- 2,6,7-Trihydroxy-9-phenyl-3H-xanthen-3-one,2,6,7-Trihydroxy-9-phenylisoxanthen-3-one,9-Phenyl-2,6,7-trihydroxy-3-fluorone,9-Phenyl-3-fluorone,Fluorone Black
- Synonyms
- 975-17-7C19H12O52,6,7-Trihydroxy-9-phenyl-3H-xanthen-3-one2,6,7-Trihydroxy-9-phenylisoxanthen-3-one9-Phenyl-2,6,7-trihydroxy-3-fluorone9-Phenyl-3-fluoroneFluorone Black

Histological Staining
9-Phenyl-2,3,7-trihydroxy-6-fluorone serves as a metachrome dye, utilised with an iron mordant in histological and hematological staining techniques. It aids in the differential visualisation of cellular and tissue components.
Cell Biology Research
This compound finds application as a laboratory reagent in cell biology studies. Its properties as a dye assist in microscopic examination and analysis of cellular structures and processes.
Dye and Stain Applications
As a fluorone derivative, 9-Phenyl-2,3,7-trihydroxy-6-fluorone functions within the broader category of stains and dyes. Its specific spectral properties (λmax 552 nm) inform its suitability for particular staining protocols.
| Molecular weight | 320.30 |
|---|---|
| Empirical formula | C19H12O5 |
| Application | An iron mordant metachrome dye |
| Melting point | >300 °C(lit.) |

Hazard statements
- H315Causes skin irritation
- H319Causes serious eye irritation
- H335May cause respiratory irritation
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P305IF IN EYES
| Protective equipment | dust mask type N95 (US), Eyeshields, Gloves |
|---|---|
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xi |
| Risk statements (R) | 36/37/38 |
| Safety statements (S) | 26-36 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
| Absorption | λmax 552 nm |
|---|
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is 9-Phenyl-2,3,7-trihydroxy-6-fluorone used for?
+
9-Phenyl-2,3,7-trihydroxy-6-fluorone is used as an iron mordant metachrome dye in cell biology, hematology, and histology laboratories for staining purposes.
What is the CAS number and formula for 9-Phenyl-2,3,7-trihydroxy-6-fluorone?
+
The CAS number is 975-17-7 and its empirical formula is C19H12O5 (Hill Notation).
What grade and purity does Tech Serve Solutions supply?
+
Tech Serve Solutions supplies 9-Phenyl-2,3,7-trihydroxy-6-fluorone for research and laboratory use. The specific assay and purity details are available on the product's technical documentation. We do not represent this product as USP, BP, or EP grade.
What are the safety and handling considerations for this chemical?
+
This compound is classified as a Warning, with hazards including skin irritation (H315), eye irritation (H319), and respiratory irritation (H335). Appropriate personal protective equipment such as a dust mask (N95), eyeshields, and gloves should be used. Handle in a well-ventilated area.
How is 9-Phenyl-2,3,7-trihydroxy-6-fluorone packed, shipped, and exported?
+
Tech Serve Solutions adheres to all relevant regulations for packing, shipping, and exporting chemical products globally, ensuring safe and compliant transit.
How can I request a sample or a quote for 9-Phenyl-2,3,7-trihydroxy-6-fluorone?
+
To request a sample or obtain a quotation, please contact our sales department through the provided channels on the Tech Serve Solutions website.
▶ Related products

(−)-Curcumol
C15H24O2
Cell Biology
(±) Clopidogrel hydrogensulfate
Cell Biology

(±)-L-Alliin
C6H11NO3S
Cell Biology
(±)-2-Amino-4-phosphonobutyric acid
C4H10NO5P
Cell Biology
(±)-2-Methylarachidonoyl-2′-fluoroethylamide
C23H38NOF
Cell Biology
(±)-3,4-Methylenedioxy-N-ethylamphetamine hydrochloride
Cell Biology

(±)-3,4-Methylenedioxyamphetamine hydrochloride
Cell Biology

(±)-3,4-Methylenedioxymethamphetamine hydrochloride
Cell Biology
▶ Explore more

3-Methyl-1,5-di-p-tolyl-1,4-pentazadiene
Chemical Synthesis

3-Methyl-1,5-pentanediol
Chemical Synthesis

3-Methyl-1-(2-methylphenyl)-1H-pyrazol-5-amine
C11H13N3
Chemical Synthesis
3-Methyl-1-(3′-sulfoamidophenyl)-5-pyrazolone
C10H11N3O3S
Chemical Synthesis