Reactive Blue 4
Reactive Blue 4 (CAS: 13324-20-4), a complex organic compound with the formula C23H14Cl2N6O8S2 and a molecular weight of 637.43 g/mol, is a notable synthetic dye. Primarily recognised for its vibrant colour, it finds extensive application as a histological and haematological stain. Its chemical structure allows for effective binding in biological tissues, making it a valuable reagent in laboratory settings for cellular and tissue analysis.
- IUPAC
- 1-Amino-4-[3-(4,6-dichlorotriazin-2-ylamino)-4-sulfophenylamino]anthraquinone-2-sulfonic acid,Procion® blue MX-R

Histological Staining
Reactive Blue 4 is widely employed as a stain in histology for the visualisation of cellular and tissue structures. Its chromophoric properties enable differential staining, aiding in microscopic examination and diagnosis.
Haematological Staining
In haematology, this dye serves as a reagent for staining blood cells and components. It assists in identifying and differentiating various blood cell types, crucial for diagnostic procedures.
Biological Research
As a bioactive small molecule, Reactive Blue 4 is utilised in cell biology research. It can serve as a tool for investigating cellular processes and functions that involve specific biological pathways or targets.
| Molecular weight | 637.43 |
|---|---|
| Empirical formula | C23H14Cl2N6O8S2 |
| Composition | Dye content, 35% |

Hazard statements
- H319Causes serious eye irritation
Precautionary statements
- P305IF IN EYES
| Protective equipment | dust mask type N95 (US), Eyeshields, Gloves |
|---|---|
| Water hazard class (WGK, DE) | 2 |
| Hazard codes (EU) | Xi |
| Risk statements (R) | 36 |
| Safety statements (S) | 26 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
| Colour Index Number | 61205 |
|---|---|
| Gene Information | rat ... P2rx1(25505) |
| Absorption | λmax 595 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 Reactive Blue 4 used for?
+
Reactive Blue 4 is primarily used as a stain in histology and haematology for visualising cellular and tissue structures, and also finds application in cell biology research.
What are the CAS number and formula for Reactive Blue 4?
+
The CAS number for Reactive Blue 4 is 13324-20-4, and its empirical formula is C23H14Cl2N6O8S2.
What grade and purity does Tech Serve Solutions supply?
+
Tech Serve Solutions supplies Reactive Blue 4 with a dye content of 35%. We do not represent this product as USP, BP, EP, or for nutraceutical or food applications.
What are the main safety hazards associated with Reactive Blue 4?
+
Reactive Blue 4 is classified with a GHS07 symbol and a 'Warning' signal word, indicating it may cause serious eye irritation (H319). It is advisable to wear eyeshields, gloves, and a type N95 dust mask during handling.
Is Reactive Blue 4 available for international export?
+
Yes, Tech Serve Solutions is a global supplier and exporter of fine chemicals, including Reactive Blue 4, serving clients worldwide.
How can I request a sample or quote for Reactive Blue 4?
+
To request a sample or obtain a quotation for Reactive Blue 4, please contact our sales department via the website or direct email.
▶ 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