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項目                                    分析純    
                                         (AR)
外觀Appearance                          白色至粉色或淺灰色至黃褐色粉末
紅外光譜鑒別Infrared spectrometry       和對照品匹配
紫外光譜UV spectrometry                 符合
PH變色域Vis. transition interval        pH 8.2 (無色) -pH 9.8 (紅色)
λ max.                                  563.0 to 568.0 nm(5 mg/L pH 9.8)
吸光值A(chǔ)bsorbance                        ≥0.590(5 mg/L, pH 9.8, 563.0 to 568.0 nm)
醇溶解試驗Solubility in EtOH            clear
干燥損失Drying loss                     ≤ 1.0 %
灼燒殘渣Ignition residue(Sulfate)       ≤0.1 %