Molekula
Chromotrope 2R (C.I. 16570)
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
Chromotrope 2R (C.I. 16570) is the disodium salt of a monoazo dye used primarily as a histological stain, notably as the plasma stain in Gomori trichrome and modified trichrome techniques. It is a water-soluble, red-violet powder with a molecular formula of C16H10N2Na2O8S2 and a molecular weight of 468.37 g/mol. CAS number: 4197-07-3. Store at ambient temperature. Signal word: Warning. Molekula supplies Chromotrope 2R 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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50 g — £60.00 per pack ex VAT · £72.00 inc. VAT
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100 g — £85.20 per pack ex VAT · £102.24 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 | Reddish-Brown powder |
| Solubility | Soluble in water |
| Dye Content | ≥85.0% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Neutral |
Identification
| Property | Value |
|---|---|
| SKU | 20169275 |
| CAS Number | 4197-07-3 |
| IUPAC Name | disodium;4,5-dihydroxy-3-phenyldiazenylnaphthalene-2,7-disulfonate |
| Molecular Formula | C16H10N2Na2O8S2 |
| Molecular Weight | 468.37 |
| Exact Mass | 467.9674 |
| SMILES | C1=CC=C(C=C1)N=NC2=C(C3=C(C=C(C=C3C=C2S(=O)(=O)[O-])S(=O)(=O)[O-])O)O.[Na+].[Na+] |
| InChIKey | GXEAXHYQKZAJGB-UHFFFAOYSA-L |
| InChI | InChI=1S/C16H12N2O8S2.2Na/c19-12-8-11(27(21,22)23)6-9-7-13(28(24,25)26)15(16(20)14(9)12)18-17-10-4-2-1-3-5-10;;/h1-8,19-20H,(H,21,22,23)(H,24,25,26);;/q;2*+1/p-2 |
| PubChem CID | 20172 |
| REACH Code | Y113 |
| HTS Code | 2927.00.50.00 |
| Tariff Code | 2927000090 |
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, Portuguese, 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 Chromotrope 2R
- Acid Red 29
- C.I. Acid Red 29
- Chromotrope 2R
- Chromotrope Red 2R
- Cromatrope 2R
- Disodium 4,5-dihydroxy-3-phenylazonaphthalene-2,7-disulphonate
- Fast fuchsin G
- Fast fuchsine G
- Hispacid fuchsin G
Frequently asked questions
What is Chromotrope 2R used for?
Chromotrope 2R is primarily used as a histological stain, serving as the plasma stain in trichrome techniques such as the Gomori trichrome and modified trichrome stains.
What is the chemical formula and molecular weight of Chromotrope 2R?
The formula is C16H10N2Na2O8S2 with a molecular weight of 468.37 g/mol.
How should Chromotrope 2R be stored?
It should be stored at ambient temperature, protected from moisture and direct sunlight.
What grade of Chromotrope 2R is available?
Molekula supplies Chromotrope 2R in technical grade, suitable for industrial applications.
Can Molekula supply Chromotrope 2R in bulk?
Yes, Molekula can supply Chromotrope 2R in bulk quantities—please contact sales for details.
What documentation comes with a Chromotrope 2R order?
Each order includes a Certificate of Analysis and Safety Data Sheet (SDS) compliant with GHS standards.
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.