Naphthol Green B
Naphthol Green B (CAS: 19381-50-1) is an iron complex with the molecular formula C30H15FeN3Na3O15S3 and a molecular weight of 878.46 g/mol. This compound is a vital analytical reagent and a widely used stain in biological and histological applications. Its distinct colour properties make it valuable in various laboratory procedures, including microscopy and complexometric titrations.
- IUPAC
- Acid Green 1

Histological Staining
Naphthol Green B is extensively employed as a stain in histology for microscopic examination. It effectively stains cytoplasm and connective tissue, aiding in the visualisation of cellular structures.
Complexometric Titration Indicator
This compound serves as a reliable indicator in complexometric titrations. It facilitates the accurate determination of metal ion concentrations by visualising the endpoint of the reaction.
Analytical Reagent
As a versatile analytical reagent, Naphthol Green B is utilised in various laboratory analyses. Its specific spectral properties can be leveraged in spectrophotometric methods.
Cell Biology Research
In cell biology, Naphthol Green B is used to study cellular components and processes. It can help differentiate between various cellular elements under microscopic observation.
| Molecular weight | 878.46 |
|---|---|
| Empirical formula | C30H15FeN3Na3O15S3 |
| Grade | for complexometryfor microscopy (Hist.) |
| 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 | 10020 |
|---|---|
| Absorption | λmax 714 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 Naphthol Green B used for?
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Naphthol Green B is used as a histological stain for cytoplasm and connective tissue, as an indicator in complexometric titrations, and as a general analytical reagent in laboratory settings.
What are the CAS number and formula for Naphthol Green B?
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The CAS number for Naphthol Green B is 19381-50-1, and its empirical formula is C30H15FeN3Na3O15S3.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies Naphthol Green B for complexometry and for microscopy (Histological grade). Please refer to the product specifications for detailed purity information. We do not represent this product as USP, BP, or EP grade unless explicitly stated.
What are the safety considerations for handling Naphthol Green B?
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When handling Naphthol Green B, it is essential to use personal protective equipment, including eyeshields, gloves, and a type N95 (US) or type P1 (EN143) respirator filter. The product has a WGK Germany classification of 3, indicating a high hazard to water.
How is Naphthol Green B packed, shipped, and exported?
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Naphthol Green B is carefully packed to ensure integrity during transit and is available for export globally by Tech Serve Solutions, a trusted supplier since 1998.
How can I request a sample or quote for Naphthol Green B?
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To request a sample or a detailed quote for Naphthol Green B, please contact our sales team through the website or via direct inquiry.
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