Appearance: white crystal, Purity: 99%min, Moisture: 0.2%max, Chroma: 30#max, . Melting point: 120-123 degree C UNNO.3241 CLASS 4.1Appearance: white crystal, Purity: 99%min, Moisture: 0.2%max, Chroma: 30#max, Melting point: 120-123 degree C. Bronopol