Molekula
Alkali Blue 6B (C.I. 42750)
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Alkali Blue 6B (C.I. 42750) is a synthetic triarylmethane dye widely used in textiles, plastics, and inks for its vibrant blue hue and excellent lightfastness. It is also employed in biological staining and as a pH indicator. This chemical has a CAS number of 1324-80-7, a molecular formula of C37H30N3NaO4S, and a molecular weight of 635.71. It is stored at ambient conditions and carries a signal word of Warning. Molekula supplies Alkali Blue 6B from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
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1 g — £30.90 per pack ex VAT · £37.08 inc. VAT
Need a different quantity or pack?
Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | Brownish black powder |
| Assay (Spectrophotometry) | ≥50% |
| Loss on Drying (110°C, 1hr) | <6% |
| Visual Transition Interval | From pH 9.4 (blue) to pH 14.0 (red) |
| Solubility (0.1% water) | Dark blue solution |
| Absorptivity 1%/ 1cm, (MeOH + 1ml 1N HCL) at λ max. 594.6 nm | ≥900 |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Base |
Identification
| Property | Value |
|---|---|
| SKU | 15115825 |
| CAS Number | 1324-80-7 |
| IUPAC Name | sodium 2-[4-[bis(4-anilinophenyl)-hydroxymethyl]anilino]benzenesulfonate |
| Molecular Formula | C37H30N3NaO4S |
| Molecular Weight | 635.71 |
| Exact Mass | 635.1855 |
| SMILES | C1=CC=C(C=C1)NC2=CC=C(C=C2)C(C3=CC=C(C=C3)NC4=CC=CC=C4)(C5=CC=C(C=C5)NC6=CC=CC=C6S(=O)(=O)[O-])O.[Na+] |
| InChIKey | BPCZPTGXEYXQRS-UHFFFAOYSA-M |
| InChI | InChI=1S/C37H31N3O4S.Na/c41-37(27-15-21-32(22-16-27)38-30-9-3-1-4-10-30,28-17-23-33(24-18-28)39-31-11-5-2-6-12-31)29-19-25-34(26-20-29)40-35-13-7-8-14-36(35)45(42,43)44;/h1-26,38-41H,(H,42,43,44);/q;+1/p-1 |
| PubChem CID | 71464047 |
| REACH Code | Y113 |
| HTS Code | 3204.12.17.00 |
| Tariff Code | 3204120090 |
Safety & GHS
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Health Hazard
GHS07
Hazard statements
- H315 Causes skin irritation
- H319 Causes serious eye irritation
- H335 May cause respiratory irritation
Precautionary statements
- P261 Avoid breathing dust/fume/gas/mist/vapours/spray
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P302+352 IF ON SKIN: Wash with soap and water
- P304+340 IF INHALED: Remove victim to fresh air and keep at rest in a position comfortable for breathing
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Polish, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- Acid blue19
- Alkali blue 6B monosodium
- Alkali blue 6B monosodium(IND)
- Basic blue 6b indicator (9.4-14.0)
- BPCZPTGXEYXQRS-UHFFFAOYSA-M
- C37H30N3NaO4S
- Sodium 2-(4-(bis(4-anilinophenyl)(hydroxy)methyl)anilino)benzene-1-sulfonate
- sodium;2-[4-[bis(4-anilinophenyl)-hydroxymethyl]anilino]benzenesulfonate
Frequently asked questions
What is Alkali Blue 6B (C.I. 42750) commonly used for?
Alkali Blue 6B is primarily used as a dye in textiles, paper, leather, and plastics for vibrant blue coloring, as well as in inks and cosmetics.
What is the chemical formula and molecular weight of Alkali Blue 6B?
The chemical formula is **C₃₇H₃₀N₃NaO₄S**, and the molecular weight is **635.71 g/mol**.
How should Alkali Blue 6B be stored?
Store at **ambient temperature** in a cool, dry place, away from direct sunlight and incompatible substances.
What grades or purity levels of Alkali Blue 6B does Molekula supply?
Molekula supplies **technical-grade Alkali Blue 6B** suitable for industrial applications, with purity levels specified per order.
Can Molekula supply Alkali Blue 6B in bulk quantities?
Yes, we can provide Alkali Blue 6B in bulk, with flexible packaging options (e.g., drums, bags) based on customer requirements.
What documentation comes with an order of Alkali Blue 6B?
Each order includes a **Certificate of Analysis (CoA)**, Material Safety Data Sheet (MSDS), and batch-specific documentation for traceability.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.