Fast Red RC Salt
Fast Red RC Salt (CAS: 68025-25-2) is a diazonium salt complex with the empirical formula C7H6Cl2N2O · 0.5ZnCl2 and a molecular weight of 273.19. As a Colour Index Number 37120 dye, it serves as a valuable reagent. It is primarily utilised in biological staining techniques, particularly in histology and cell biology, for the visualisation of cellular structures and enzyme activity. Its chemical properties make it suitable for various diagnostic and research applications.
- IUPAC
- 2-Amino-4-chloroanisole diazotated zinc chloride complex,5-Chloro-2-methoxybenzenediazonium chloride hemi(zinc chloride) salt,Diazo Fast Red RC
- Synonyms
- 2-Amino-4-chloroanisole diazotated zinc chloride complex5-Chloro-2-methoxybenzenediazonium chloride hemi(zinc chloride) saltDiazo Fast Red RC

Histological Staining
Fast Red RC Salt is employed as a stain in histology for microscopic examination. It aids in the differentiation and visualisation of tissue components, contributing to accurate pathological diagnosis.
Cell Biology Research
In cell biology, this compound can be used as a fluorescent probe or substrate for enzyme detection. It helps researchers study cellular processes and enzyme kinetics in vitro.
Diagnostic Reagent
The dye's properties lend themselves to use in diagnostic assays, potentially for detecting specific enzymes or cellular markers in biological samples.
| Molecular weight | 273.19 |
|---|---|
| Empirical formula | C7H6Cl2N2O · 0.5ZnCl2 |
| Composition | Dye content, ~20% |
| Protective equipment | Eyeshields, Gloves, type N95 (US), type P1 (EN143) respirator filter |
|---|---|
| Water hazard class (WGK, DE) | 3 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
| Colour Index Number | 37120 |
|---|
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 Fast Red RC Salt used for?
+
Fast Red RC Salt is primarily used in histological and cell biology applications, often as a stain for visualising cellular structures or as a fluorescent substrate for enzyme detection.
What are the CAS number and formula for Fast Red RC Salt?
+
The CAS number for Fast Red RC Salt is 68025-25-2. Its empirical formula is C7H6Cl2N2O · 0.5ZnCl2, and its molecular weight is 273.19.
What grade and purity does Tech Serve Solutions supply for Fast Red RC Salt?
+
Tech Serve Solutions supplies Fast Red RC Salt with a dye content of approximately 20%. We do not represent this product as USP, BP, or EP grade.
What are the safety and handling precautions for Fast Red RC Salt?
+
Fast Red RC Salt is classified with WGK Germany 3. Handling requires appropriate personal protective equipment, including eyeshields and gloves. A type N95 (US) or type P1 (EN143) respirator filter is recommended.
Is Fast Red RC Salt a controlled substance?
+
The provided data does not indicate that Fast Red RC Salt is a controlled substance.
How is Fast Red RC Salt packed, shipped, and exported?
+
As a global supplier, Tech Serve Solutions ensures appropriate packaging and adherence to regulations for the export of chemicals like Fast Red RC Salt.
How can I request a sample or quote for Fast Red RC Salt?
+
To request a sample or quote for Fast Red RC Salt, please contact our sales team through the website or by phone.
▶ Related products
![(±)-(E)-4-Ethyl-2-[(E)-hydroxyimino]-5-nitro-3-hexenamide (C8H13N3O4) — chemical structure, CAS 138472-01-2; Biochemicals & Reagents, fine chemical supplied by Tech Serve Solutions](/_next/image?url=https%3A%2F%2Fpub-f4d920c906024441a773a96f7098e551.r2.dev%2Fimages%2Fproducts%2F138472-01-2.png&w=3840&q=75)
(±)-(E)-4-Ethyl-2-[(E)-hydroxyimino]-5-nitro-3-hexenamide
C8H13N3O4
Biochemicals & Reagents![(±)-(E)-4-Ethyl-2-[(Z)-hydroxyimino]-5-nitro-3-hexen-1-yl-nicotinamide (C14H18N4O4) — chemical structure, CAS 162626-99-5; Biochemicals & Reagents, fine chemical supplied by Tech Serve Solutions](/_next/image?url=https%3A%2F%2Fpub-f4d920c906024441a773a96f7098e551.r2.dev%2Fimages%2Fproducts%2F162626-99-5.png&w=3840&q=75)
(±)-(E)-4-Ethyl-2-[(Z)-hydroxyimino]-5-nitro-3-hexen-1-yl-nicotinamide
C14H18N4O4
Biochemicals & Reagents
(±)-2,5-Dimethoxy-4-bromoamphetamine hydrobromide
Biochemicals & Reagents

(±)-2-(p-Methoxyphenoxy)propionic acid
C10H12O4
Biochemicals & Reagents
(±)-2-Amino-6,7-dihydroxy-1,2,3,4-tetrahydronaphthalene hydrobromide
C10H13NO2·HBr
Biochemicals & Reagents
(±)-2-Hydroxydecanoic acid
C10H20O3
Biochemicals & Reagents
(±)-3-Hydroxydecanoic acid
C10H20O3
Biochemicals & Reagents
(±)-3-Hydroxyoctanoic acid
C8H16O3
Biochemicals & Reagents


