CAS Number
493-52-7
Formula
C15H15N3O2
Weight
269.31
[2-[4-(Dimethylamino)phenyl azo] Benzoic Acid]
| Appearance | Dark red to maroon to violet or purple powder or crystals |
| Identity | p/t. |
| pH transition range (4,4 - 6,2) | Pink Red - yellow orange |
| Insoluble matter in ethanol (1 g/L) | p/t. |
| Absorption maxima (buffer pH 4,5) | 523 - 526 nm |
| Absorption maxima (buffer pH 6,2) | 427 - 437 nm |
| Loss on drying (at 110°C) | Max 5,0% |
| Residue on ignition (as SO4) | Max 2,0% |
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