4-Amino-5-hydroxy-2,7-naphthalenedisulfonic acid monosodium salt hydrate
4-Amino-5-hydroxy-2,7-naphthalenedisulfonic acid monosodium salt hydrate (CAS: 312693-54-2) is a chemical compound with a molecular weight of 341.29 g/mol (anhydrous basis). This substance is primarily utilised as a dye intermediate and finds applications in various staining procedures within biological and histological contexts. Its specific chemical structure makes it valuable for applications requiring chromogenic properties in scientific research and diagnostic settings.
- IUPAC
- H Acid
- Synonyms
- H Acid

Dye Intermediate
Serves as a crucial precursor in the synthesis of various azo dyes, contributing to their colouristic properties. Its chemical structure is well-suited for coupling reactions in dye manufacturing.
Histological Staining
Utilised as a component in histological stains, aiding in the visualisation of cellular structures. It assists in differential staining techniques for tissue samples.
Cell Biology Research
Employed in cell biology for specific staining applications, helping researchers to identify and analyse cellular components. It can be used in conjunction with other reagents for detailed cellular studies.
Hematology Applications
Applicable in hematological staining procedures for the examination of blood cells and tissues. It contributes to the accurate differentiation of various blood cell types.
| Molecular weight | 341.29 (anhydrous basis) |
|---|---|
| Linear formula | H2NC10H4(OH)(SO3H)SO3Na · xH2O |
| Assay | 85% |
| 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.
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 4-Amino-5-hydroxy-2,7-naphthalenedisulfonic acid monosodium salt hydrate used for?
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This compound is primarily used as a dye intermediate and in staining applications for cell biology, hematology, and histology.
What are the CAS number and formula for this product?
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The CAS number is 312693-54-2. The linear formula is H₂NC₁₀H₄(OH)(SO₃H)SO₃Na · xH₂O.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies this product with an assay of 85%. We do not represent this product as USP, BP, or EP grade.
What are the safety precautions for handling this chemical?
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This product carries a Warning signal word with hazards 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. Handle in a well-ventilated area.
How is this product packed, shipped, and exported?
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Tech Serve Solutions specialises in global supply and export of fine chemicals, adhering to all relevant shipping and safety regulations.
How can I request a sample or quote?
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Please contact our sales team directly through our website or by phone to request a sample or a detailed quotation.
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