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Contact SupplierAppearance | Dark red to maroon to violet or purple powder or crystals |
Identity | Passes test |
pH transition range (4.2 - 6.2) | Pink Red – yellow orange |
Insoluble matter in ethanol (1 g/L) | Passes test |
Absorption maxima (buffer pH 4.2) | 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% |