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Contact SupplierAppearance | Red-brown to dark brown crystalline powder |
Solubility (0.1% in 0.1 N NaOH) | Clear reddish to violet |
Absorption maxima (0.1N NaOH) | 575 - 585 nm |
Absorptivity (A 1%/1cm; at λmax) | Min 550 |
Loss on drying (at 105°C; 1 hr) | Max 7% |
Sensitivity for Zinc | Passes test |