Sunset Yellow FCF
Sunset Yellow FCF (CAS: 2783-94-0), a synthetic azo dye with the molecular formula C16H10N2Na2O7S2 and a molecular weight of 452.37 g/mol, is a vibrant orange-yellow colourant. It is commonly employed as a staining agent in biological and histological applications. This dye is recognised by its Colour Index number 15985 and finds utility in various scientific and industrial settings requiring precise colouration.
- IUPAC
- Food Yellow 3

Biological Staining
Sunset Yellow FCF is utilised as a staining agent in cell biology and histology laboratories. Its distinct colouration aids in visualising cellular structures and tissues during microscopic examination.
Dye Applications
With its Colour Index number 15985, this synthetic azo dye is applied in contexts requiring a stable and vibrant orange-yellow hue. It serves as a colourant in various scientific and industrial materials.
Research and Development
In R&D settings, Sunset Yellow FCF can be used as a reference standard or a component in colour formulation studies. Its well-defined chemical properties make it suitable for specific analytical purposes.
| Molecular weight | 452.37 |
|---|---|
| Empirical formula | C16H10N2Na2O7S2 |
| 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) | 2 |
| 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.
| Colour Index Number | 15985 |
|---|---|
| Absorption | λmax 482 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 Sunset Yellow FCF used for?
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Sunset Yellow FCF is primarily used as a staining agent in cell biology and histology, and as a colourant in various scientific and industrial applications. It is identified by its Colour Index number 15985.
What are the CAS number and formula for Sunset Yellow FCF?
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The CAS number for Sunset Yellow FCF is 2783-94-0, and its molecular formula is C16H10N2Na2O7S2.
What grade and purity does Tech Serve Solutions supply for Sunset Yellow FCF?
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Tech Serve Solutions supplies Sunset Yellow FCF, identified by Colour Index number 15985, suitable for laboratory research and general industrial use. While specific purity assays may vary, TSS does not represent this product as USP, BP, or EP grade unless explicitly stated. Please refer to the product's Certificate of Analysis for detailed specifications.
What are the safety and handling precautions for Sunset Yellow FCF?
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Sunset Yellow FCF is classified with GHS symbol GHS07 and signal word Warning. It carries hazard statements H315 (Causes skin irritation), H319 (Causes serious eye irritation), and H335 (May cause respiratory irritation). Recommended personal protective equipment includes a dust mask type N95 (US), eyeshields, and gloves. Always handle in a well-ventilated area.
How is Sunset Yellow FCF packed and shipped?
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Tech Serve Solutions packs and exports Sunset Yellow FCF, ensuring compliance with all relevant shipping regulations. Specific packaging details can be provided upon request. We facilitate global distribution for research and industrial needs.
How can I request a quote or sample for Sunset Yellow FCF?
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To request a quote or a sample of Sunset Yellow FCF (CAS: 2783-94-0), please contact our sales department via the website or direct email. Our team will promptly assist you with your inquiry.
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