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Congo Red
(CAS RN:573-58-0 Product Number:C0550)


Congo Red
Synonym Direct Red 28

General Information

Product Number C0550

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Purity/Analysis Method >98.0%(HPLC)
Storage Temperature
M.F. / M.W. C32H22N6Na2O6S2=696.66
CAS RN 573-58-0
Related CAS RN
MDL Number MFCD00004028
Packaging and Container
  • Product Details
  • Safety & Regulations


Appearance Dark red to Brown powder to crystal
Purity(HPLC) min. 98.0 area%
Absorbance min. 0.270(10 mg/L, pH 5.0, 488.0 to 492.0 nm)
Solubility in hot Water transparency
Drying loss max. 8.0 %
Ignition residue(Sulfate) 18.0 to 40.0 %(after drying)
Transition interval(pH) (purple)2.6 to 4.0(dark redish orange)


Colour Index 22120
Beilstein 16(3)474
Reaxys-RN 6765909
PubChem SID 87565658
Merck Index(14) 2498
RTECS# QK1400000
EC Number 209-358-4


Signal Word Danger
Hazard Statements
  • H350
  • :May cause cancer.
  • H361d
  • :Suspected of damaging the unborn child.
Precautionary Statements
  • P201
  • :Obtain special instructions before use.
  • P202
  • :Do not handle until all safety precautions have been read and understood.
  • P280
  • :Wear protective gloves, protective clothing, face protection.
  • P308+P313
  • :IF exposed or concerned: Get medical advice or attention.
  • P405
  • :Store locked up.
  • P501
  • :Dispose of contents/container through a waste management company authorized by the local government.

Transport Information

HS Number 3204140000


PubMed Literature

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