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C.I. 22120
Congo red
CAS 573-58-0
Assay 99%min
Packing 25kg/drum
Direct red 28
| Name | Direct Red 28 |
| Synonyms | C.I. 22120; Congo red |
| Molecular Structure | ![CAS # 573-58-0, Direct Red 28, C.I. 22120, Disodium 3,3'-[[1,1'-biphenyl]-4,4'-diylbis(azo)]bis(4-aminonaphthalene-1-sulphonate)](https://www.chemblink.com/structures/573-58-0.gif) |
| Molecular Formula | C32H22N6Na2O6S2 |
| Molecular Weight | 696.66 |
| CAS Registry Number | 573-58-0 |
| EC Number | 209-358-4 |
Uses:
1. Acid base indicator, pH 3.0 (blue purple) -5.0 (red);
2. Detect hydrochloric acid and paper acidity in gastric juice; Testing boric acid and cyanide;
3. Additives for biological culture media;
4. Biological staining, such as staining of embryo sections, plant mucin, cellulose, elastic tissue, etc.
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