Technical Data Sheet
Congo red (C.I. 22120), 25 g
for microscopy
Please consider that this product might be liable to some legal sanctions as for example to obtain an end user declaration or the prohibition of some applications. For details please do contact your counterpart in our sales department!
H350-H361d
may cause cancer, suspected of damaging the unborn child
P202 P308+P313
do not handle until all safety precautions have been read and understood, IF exposed or concerned: Get medical advice/attention
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Disodium-3,3'[[1,1-biphenyl]-4,4'-diyl(bis(azo)]bis(4-aminonaphthalin-1-sulfonate), Direct Red 28
Empirical formula C32H22N6Na2O6S2
Molar mass (M) 696,66 g/mol
Melting point (mp) 360 °C
WGK 3
CAS No. 573-58-0
EG-Nr. 209-358-4
Molar mass (M) 696,66 g/mol
Melting point (mp) 360 °C
WGK 3
CAS No. 573-58-0
EG-Nr. 209-358-4
Bacteriology, indicator pH 3.0-5.2
Dissolve 0.2 g in 100 ml of water
Dissolve 0.2 g in 100 ml of water
Azo dye, soluble in water (colloidal solution) and ethanol. A 1 % solution in ethanol is used for detection of amyloid proteins (= abnormally mutated proteins).
€37.55/Pack Qty.
excl. VAT. | 25 g per Pack Qty.
Art. No. 0322.2
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€35.67/Pack Qty.
from 24 Pack Qty.
€33.80/Pack Qty.
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Product details
Congo red (C.I. 22120) for microscopy
Azo dye, soluble in water (colloidal solution) and ethanol. A 1 % solution in ethanol is used for detection of amyloid proteins (= abnormally mutated proteins).
Technical Information
| Colour conversion | blue - red |
| Transition range pH | 3,0 - 5,2 |
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Congo red (C.I. 22120)
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| Art. No. | Pack Qty. | Pack. | Price | Quantity | |
|---|---|---|---|---|---|
| 0322.1 | 5 g | glass |
€23.15 |
|
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| 0322.2 | 25 g | glass |
€37.55 |
|
|
| 0322.3 | 100 g | glass |
€91.30 |
|
|
|
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Downloads / MSDS
General information
Indicators and Dyes
Carl ROTH offers many indicators and dyes of high purity, which can be used in special applications.
Certificates of Analysis
Type analysis
| Absorption max. (in H2O) | 490-500 nm |
| Loss on drying | ≤5.0 % |
| pH-transition range | 3.0 (blue) - 5.2 (red) |
| Suitability for microscopy | complies |