从乙酸中析出者为微细的黄色结晶。微溶于水，溶于乙醇、乙醚、乙酸乙酯和苯。对碱很敏感，遇碱性水溶液呈特殊的蓝绿色。熔点  225 °C  
    
密度  0.79 g/mL at 20 °C闪点  12 °C 
 

GB/T 15349-94
项目Item                                       分析纯
                                                (AR)
变色域Visual transition interval        　     3.8(黄绿)～5.4(蓝)
最大吸收波长(nm)Wave length of
max absorbance
    λ1 (pH 3.8)                                440-445
    λ2 (pH 5.4)                                615-618
质量吸收系数Absorbance,L/cm·g
    α1(λ1,pH 3.8,干样)                         24-28
    α2(λ2,pH 5.4,干样)                         53-58
乙醇溶解试验Solubility in ethanol              合格
干燥失重Drying loss,%                          ≤3.0
灼烧残渣(以硫酸盐计)Ignition residue,%         ≤0.25


品级Grade                               ACS级   
                                (ACS reagent, Dye content 95 %) 
外观Appearance                          褐色至棕色粉末
红外光谱鉴别Infrared spectrometry       Conforms
纯度Purity                              ≥95.0% (HPLC) 
λ  422 - 426 nm 
Extinction Coefficient                  ≥17000 
  c = 0.03g/l; Acified Methanol  
Appearance (Clarity) Pass 
Visual Interval                        Pass 
                                       pH 3.8 Yellow 
Visual Interval                        Pass 
                                       pH 4.5 Green 
Visual Interval                        Pass 
                                       pH 5.4 Blue


品级Grade                               ACS级   

外观Appearance                         褐色至棕色粉末
红外光谱鉴别Infrared spectrometry      Conforms
Visual Interval                        Pass 
                                       pH 3.8 Yellow 
Visual Interval                        Pass 
                                       pH 4.5 Green 
Visual Interval                        Pass 
                                       pH 5.4 Blue
 

WGK Germany  3
    
RTECS  SJ7456000 
    
海关编码  29349990 
    
危险品标志  F,Xi 
    
危险类别码  11-36-67-36/37/38 
    
安全说明  7-16-24/25-26-37/39 
    
危险品运输编号  UN 1219 3/PG 2

指示剂，但pH=3.8时呈黄色，pH=5.4时呈蓝绿色，pH=4.5时开始有颜色的明显变化。
 
密封保存。