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Congo Red

Dye content ≥35 %

Cosmos Red, Direct Red 28, Cotton Red C, Congo Red 4B, Cotton Red B, Direct Red R, Direct Red Y
Empirical Formula (Hill Notation):
Número de CAS:
Peso molecular:
Número de índice de color:
Número de EC:
Número MDL:
ID de la sustancia en PubChem:



Nivel de calidad



Dye content, ≥35%


titration: suitable


6.7 (10 g/L)


>360 °C (lit.)


H2O: 1 mg/mL


diagnostic assay manufacturing

temp. de almacenamiento

room temp

SMILES string




InChI key


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Categorías relacionadas


  • Congo red has been used as a histochemical stain for the quantification of amyloid deposits in brain tissues.
  • It has been used as a cell wall inhibiting agent in fungus Cryptococcus neoformans.
  • It has also been used to study microstructural details in the cell walls of raw potato and fried potato using confocal microscopy.


25, 100 g in poly bottle

Acciones bioquímicas o fisiológicas

Congo red is a benzidine-based anionic diazo dye. It is a histological dye which binds to many amyloid proteins and is used for the quantification of amyloid β-peptide aggregation. Congo red also interacts with β-D-glucans, polysaccharides containing continuous β-(1→4)-linked D-glucopyranosyl units and some hemicellulosic galactoglucomannans.


Health hazard

Palabra de señalización


Frases de peligro

Clasificaciones de peligro

Carc. 1B - Repr. 2

Código de clase de almacenamiento

6.1C - Combustible, acute toxic Cat.3 / toxic compounds or compounds which causing chronic effects



Equipo de protección personal

Eyeshields, Gloves, type P1 (EN143) respirator filter, type P3 (EN 143) respirator cartridges

Certificado de Análisis

Introduzca el número de lote para buscar un certificado de análisis (COA).

Certificado de origen

Introduzca el número de lote para buscar un Certificado de origen (COO).

  1. Which document(s) contains shelf-life or expiration date information for a given product?

    If available for a given product, the recommended re-test date or the expiration date can be found on the Certificate of Analysis.

  2. How do I get lot-specific information or a Certificate of Analysis?

    The lot specific COA document can be found by entering the lot number above under the "Documents" section.

  3. How do I find price and availability?

    There are several ways to find pricing and availability for our products. Once you log onto our website, you will find the price and availability displayed on the product detail page. You can contact any of our Customer Sales and Service offices to receive a quote.  USA customers:  1-800-325-3010 or view local office numbers.

  4. What is the Department of Transportation shipping information for this product?

    Transportation information can be found in Section 14 of the product's (M)SDS.To access the shipping information for this material, use the link on the product detail page for the product. 

  5. Why does the SDS for Congo Red list carcinogen as an OSHA hazard, (Section 2) but in Section 11 on carcinogenicity, it states that there is no component identified as a carcinogen?

     The reason that there is not an OSHA listing for carcinogens on most of SDS that have a hazard of a carcinogen hazard  is because that section of the SDS is specifically for the OSHA regulated carcinogens, also referred to as the OSHA 13.Congo red at this time is not specifically called out as a carcinogen by the other 3 Organizations listed (IARC, NTP, ACGIH) either. Congo red is listed by the European Classification Labeling & Packaging (CLP) Regulation (which is a pretty definitive guide for hazard classification), as a carcinogen. No other organizations have had the time to classify this material at this time. This is why it is only listed as a carcinogen in section 2 and in section 15.

  6. My question is not addressed here, how can I contact Technical Service for assistance?

    Ask a Scientist here.

Quantification of cerebral amyloid angiopathy and parenchymal amyloid plaques with Congo red histochemical stain.
Wilcock DM, et al.
Nature Protocols, 1, 1591-1591 (2006)
Kinetic study and equilibrium isotherm analysis of Congo Red adsorption by clay materials.
Chemical Engineering Journal, 148, 354-364 (2009)
PKC1 is essential for protection against both oxidative and nitrosative stresses, cell integrity, and normal manifestation of virulence factors in the pathogenic fungus Cryptococcus neoformans.
Gerik KJ, et al.
Eukaryotic Cell, 7, 1685-1685 (2008)
Quantifying amyloid beta-peptide (Abeta) aggregation using the Congo red-Abeta (CR-abeta) spectrophotometric assay.
Klunk WE, et al.
Analytical Biochemistry, 266, 66-66 (1999)
Some changes in potato chips during frying observed by confocal laser scanning microscopy (CLSM).
Pedreschi F and Aguilera JM
Food Science and Technology International = Ciencia y tecnologia de Los Alimentos Internacional, 8, 197-201 (2002)

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