Sudan IV
Sudan IV (CAS 85-83-6, C24H20N4O) is a synthetic organic dye known for its fat solubility and vibrant red colour. With a molecular weight of 380.44 g/mol, it is primarily utilised as a lipid stain in biological and histological applications. This dye is crucial for identifying and visualising fat and oil within tissues and cellular structures, aiding in diagnostic and research endeavours.
- IUPAC
- Biebrich scarlet R fat soluble,Fat Ponceau R or 4,Lipid Crimson,Oil Red IV,Scarlet Red Scharlach,Solvent Red 24,Sudan R or BB
- Synonyms
- Biebrich scarlet R fat solubleFat Ponceau R or 4Lipid CrimsonOil Red IVScarlet Red ScharlachSolvent Red 24Sudan R or BB

Histological Staining
Sudan IV is widely employed as a histochemical stain to detect and differentiate lipids, triglycerides, and lipoproteins within biological tissues. Its fat-soluble nature allows for precise visualisation of these substances under microscopy.
Fat and Oil Identification
In research and diagnostic laboratories, Sudan IV serves as an effective reagent for identifying the presence and distribution of fats and oils in various samples. It is particularly useful in evaluating tissue samples for pathological conditions related to lipid metabolism.
Biological Research
This dye is a valuable tool in cell biology and biochemistry research for studying lipid dynamics, cellular structures, and the effects of various treatments on lipid content. It helps researchers to track and quantify lipid accumulation or depletion.
| Molecular weight | 380.44 |
|---|---|
| Empirical formula | C24H20N4O |
| Melting point | 199 °C (dec.)(lit.) |

Hazard statements
- H315Causes skin irritation
- H319Causes serious eye irritation
Precautionary statements
- 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) | 36/38 |
| Safety statements (S) | 26-36 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
| Colour Index Number | 26105 |
|---|
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 Sudan IV used for?
+
Sudan IV is primarily used as a lipid stain in histology and biological research to detect and visualise fats and oils within tissues and cells.
What are the CAS number and formula for Sudan IV?
+
The CAS number for Sudan IV is 85-83-6, and its molecular formula is C24H20N4O.
What grade and purity does Tech Serve Solutions supply for Sudan IV?
+
Tech Serve Solutions supplies Sudan IV typically as a technical or research grade product. We do not represent it as USP, BP, or EP grade unless explicitly stated.
How should Sudan IV be handled safely?
+
Sudan IV is a hazardous substance. Handle with appropriate personal protective equipment, including a dust mask (type N95 US), eyeshields, and gloves. Avoid contact with skin and eyes, and ensure adequate ventilation. Refer to the Safety Data Sheet (SDS) for comprehensive handling instructions.
Is Sudan IV a controlled substance?
+
The provided data does not indicate that Sudan IV is a controlled substance.
How is Sudan IV packed and exported by Tech Serve Solutions?
+
Tech Serve Solutions carefully packs and exports Sudan IV in compliance with all relevant international shipping regulations to ensure safe and secure delivery worldwide.
How can I request a sample or quote for Sudan IV?
+
To request a sample or a quotation for Sudan IV, please contact our sales department through the website or by phone, providing your specific requirements.
▶ 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▶ 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