2,4-Diaminophenol dihydrochloride
2,4-Diaminophenol dihydrochloride (CAS 137-09-7), a phenol derivative with the linear formula (H2N)2C6H3OH·2HCl and a molecular weight of 197.06 g/mol, is supplied by TSS with 98% purity. Historically, this compound, also known by the trade name 'Amidol', found significant use in the photographic industry as a developing agent and in dye manufacturing. Its chemical structure makes it a valuable intermediate in organic synthesis.
- IUPAC
- ‘Amidol’
- Synonyms
- (H2N)2C6H3OH·2HClAmidol

Photographic Developers
2,4-Diaminophenol dihydrochloride, commonly known as Amidol, was historically employed as a critical component in photographic developers, acting as a color accelerator to enhance image development.
Dye Manufacturing
The compound has been utilised within the dye manufacturing industries, serving as an intermediate or precursor in the synthesis of various colorants.
Organic Synthesis
As an organic building block, 2,4-Diaminophenol dihydrochloride is a useful reagent for chemical synthesis, enabling the creation of more complex organic molecules.
| Molecular weight | 197.06 |
|---|---|
| Linear formula | (H2N)2C6H3OH·2HCl |
| Assay | 98% |
| Application | 2,4-Diaminophenol dihydrochloride (Amidol) was used in the dye manufacturing industries and as a color accelerator in photographic developers1. |
| Melting point | 222 °C (dec.)(lit.) |

Hazard statements
- H301Toxic if swallowed
- H315Causes skin irritation
- H319Causes serious eye irritation
- H335May cause respiratory irritation
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P301IF SWALLOWED
- P305IF IN EYES
| Protective equipment | dust mask type N95 (US), Eyeshields, Faceshields, Gloves |
|---|---|
| Transport (UN / ADR) | UN 2811 6.1 / PGIII |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xn |
| Risk statements (R) | 22-36/37/38 |
| 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 2,4-Diaminophenol dihydrochloride used for?
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2,4-Diaminophenol dihydrochloride has been used in dye manufacturing and as a color accelerator in photographic developers. It also serves as a building block in organic synthesis.
What is the CAS number and formula for 2,4-Diaminophenol dihydrochloride?
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The CAS number is 137-09-7, and the linear formula is (H2N)2C6H3OH·2HCl.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 2,4-Diaminophenol dihydrochloride with a purity of 98%. We do not represent this product as meeting USP, BP, EP, or any pharmacopoeia standards.
What are the main safety hazards associated with 2,4-Diaminophenol dihydrochloride?
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2,4-Diaminophenol dihydrochloride is classified with GHS06 symbol and 'Danger' signal word. It carries hazard statements H301 (Toxic if swallowed), H315 (Causes skin irritation), H319 (Causes serious eye irritation), and H335 (May cause respiratory irritation). Appropriate personal protective equipment, including a dust mask, eyeshields, faceshields, and gloves, is essential.
How is 2,4-Diaminophenol dihydrochloride packed and shipped?
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TSS exports chemicals globally, adhering to all necessary regulations for safe packing and shipping of hazardous materials like 2,4-Diaminophenol dihydrochloride (UN 2811, 6.1 / PGIII).
How can I request a quote or sample?
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To request a quote or a sample of 2,4-Diaminophenol dihydrochloride, please contact our sales team through the website or by phone.
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