Fast Bordeaux (GP Base)
A high-purity methoxy-nitroaniline azoic base, supplied as 4-methoxy-2-nitroaniline (FBGP Base) for use as a diazo coupling base across pigment and azoic dye manufacture.
What is Fast Bordeaux (GP Base)?
Fast Bordeaux GP Base, formally 4-methoxy-2-nitroaniline, is an orange-red to red crystalline powder built on an aniline ring carrying an amino group at C-1, a nitro group at C-2, and a methoxy group at C-4.
As an azoic base, the amino group is diazotized and the resulting diazonium salt is coupled directly onto fabric or substrate that has been impregnated with a naphthol coupling component (Naphthol AS-type chemistry). The nitro and methoxy groups together define the bordeaux-to-maroon shade family this base is known for, along with good wash and light fastness.
At Chelora Dyes, Fast Bordeaux GP Base is crystallised and dried to a controlled particle profile and low moisture, so diazotization runs cleanly and gives a consistent, reproducible shade batch to batch.
- Appearance
- Orange-red / red
- Odour
- Faint, characteristic
- Solubility
- Acetone, hot alcohol
- Function
- Azoic diazo base
- Grade
- Technical / dyeing
Aniline ring with amino, nitro and methoxy substituents
- Molecular formulaC7H8N2O3
- Molecular weight168.15 g/mol
- IUPAC name4-Methoxy-2-nitroaniline
- Functional groupsPrimary amine, nitro, ether (methoxy)
- CAS number96-96-8
Technical product information
Standard specification for Chelora Dyes' technical grade Fast Bordeaux (GP Base). Custom-grade and bulk specifications are available on request.
| Chemical name | Fast Bordeaux (GP Base) |
|---|---|
| Synonyms | FBGP Base, 4-Methoxy-2-nitroaniline, 2-Nitro-p-anisidine |
| CAS number | 96-96-8 |
| Molecular formula | C7H8N2O3 |
| Molecular weight | 168.15 g/mol |
| Assay (purity) | ≥ 98.0% |
| Appearance | Orange-red to red crystalline powder |
| Melting point | 117–119°C |
| Moisture content | ≤ 0.5% |
| Insoluble matter | ≤ 0.2% |
| Solubility | Sparingly soluble in water; soluble in acetone and hot alcohol |
| Packaging | 25 kg / 50 kg bags, 500–1000 kg jumbo bags |
| Shelf life | 24 months in sealed original packaging |
Applications of Fast Bordeaux (GP Base)
Azoic (Naphthol AS) dyeing
Diazotized and coupled onto naphtholated cotton to produce bordeaux and maroon azoic shades.
Azo pigment synthesis
Used as a diazo base in pigment manufacture for deep red and maroon shades in inks and coatings.
Textile printing pastes
Applied in pigment and azoic printing paste formulation for cotton and cellulosic fabrics.
Fine chemical intermediates
Supplies a methoxy-nitroaniline core for further condensation and specialty chemical synthesis.
Fast colour salts & bases
Paired with fast colour bases and salts in traditional azoic dyeing formulations.
Analytical reagents
Used as a reference and diazo reagent in analytical and research-scale dye chemistry.
Why choose Chelora Dyes
Consistent purity
Assay controlled at ≥98% with moisture and melting range verified before dispatch.
Full documentation
COA, SDS, and regulatory data supplied with every shipment.
Flexible volumes
From 25 kg bags to jumbo-bag bulk quantities.
Technical support
Process, diazotization, and compliance guidance from our chemistry team.
Storage and guidelines
- Store in tightly sealed original packaging in a dry, dark environment.
- Keep in a cool, dry, well-ventilated area away from direct sunlight and heat sources.
- Protect from moisture pickup — the powder can cake if exposed to humid air.
- Segregate from strong oxidising agents, reducing agents and combustible materials.
- Use compatible containers: lined HDPE bags or drums.
- Re-seal bags promptly after use to preserve moisture and assay specification.
Handling precautions
Fast Bordeaux GP Base is a fine crystalline powder that can cause irritation to skin and eyes, and is harmful if swallowed or inhaled.
Use dust control measures, chemically resistant gloves, and eye protection during weighing, charging, and any bulk handling operation.
Provide local exhaust ventilation where dust generation is likely, and avoid breathing dust. Keep away from open flame and sources of ignition during diazotization.
Refer to the full Safety Data Sheet for exposure limits, spill containment, disposal, and first-aid measures before use.
Frequently asked questions
What is Fast Bordeaux GP Base used for?
Fast Bordeaux GP Base is diazotized and coupled with a naphthol component to produce bordeaux and maroon azoic shades used in cotton dyeing, pigment manufacture and printing applications.
Why does the methoxy-nitro substitution pattern matter?
The nitro group withdraws electron density and stabilises the diazonium salt formed on diazotization, while the methoxy group is electron-donating and shifts the resulting azo chromophore toward the deep bordeaux and maroon shade range once coupled.
Is Fast Bordeaux GP Base soluble in water?
It is only sparingly soluble in water. It is more soluble in organic solvents such as acetone and hot alcohol, and diazotization is normally carried out as a fine acidic suspension, as is standard for azoic bases.
What purity do you supply?
Standard technical grade is supplied at a minimum assay of 98%, with moisture and melting range held within tight limits. Higher assay grades can be manufactured to order for sensitive dyeing applications.
What packaging sizes are available?
25 kg and 50 kg multiwall paper or HDPE-lined bags, with bulk supply available in 500 kg and 1000 kg jumbo bags.
How should it be stored, and for how long?
In sealed original packaging in a cool, dry, ventilated store away from strong oxidisers and direct light. Shelf life is 24 months from manufacture when storage conditions are maintained.
Is it hazardous to handle?
It is harmful if swallowed or inhaled and can cause skin and eye irritation, so it should be handled with PPE, dust control and adequate ventilation. Review the Safety Data Sheet before any handling operation.
Do you provide a Certificate of Analysis?
Yes. Each batch ships with a Certificate of Analysis and Safety Data Sheet covering assay, moisture, melting range and appearance.
