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| Direct Scarlet 4B |
| Alias：Direct Scarlet 4B；Mitsui Congo Red（MDW）；Shangdirect Congo Red（SHD） |
| Color index：C.I. Direct Red 28(22120) |
| English name：Direct Scarlet 4B；Mitsui Congo Red（MDW）；Shangdirect Congo Red（SHD）. |
Structural formula： |
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Process flows ： |
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| Characters：brown red powder and soluble in water to become red solution with yellow light, and soluble in alcohol to become orange. |
| Quality standard |
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Index name |
Index |
Apperance strength，separated coloured light Color fastness in wool wool fabrics， impurity content insoluble in water，% moisture content，% fineness（80 meshes residual content），%
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brown red powder 100±3 of standard products similar to standard products accord to standard products ≤2 ≤3 ≤5
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| Use：Mainly used in cotton and other fabric dyeing, and cannot be directly used in printing. |
| Application performance：Colour fastness(grade) in cotton fabrics： |
Solarization |
Soaping |
Water leaching |
Perspiration |
Ironing |
Friction |
Acid and alkali resistance |
fading |
staining |
fading |
staining |
fading |
staining |
dry |
wet |
sulphuric acid |
acetic acid |
sodium carbonate |
1～2 |
3～4 |
2 |
3～4 |
2 |
2～3 |
4 |
4～5 |
3～4 |
2～3 |
1 |
2 |
3 |
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