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Contact Supplier| Appearance | A white to off white powder |
| pH range (8.2 - 10.0) | Colourless to red-violet |
| Absorption maxima (buffer pH 9.8) | 551 - 554 nm |
| Sensitivity | Passes test |
| Sulphated ash | Max 0.05% |
| Chloride (Cl) | Max 0.01% |
| Sulphate (SO4) | Max 0.01% |
| Loss on drying (at 110°C) | Max 1% |