品级Grade                               细胞培养级 
                                   (for cell culture,≥90%（HPLC))
外观Appearance                          dark brown to black with red or green cast powder
红外光谱Infrared spectrometry           Conforms to Structure
dye content(HPLC)                       ≥90.0% 
水溶性solubility                        dark red solution at 10mg plus 1ml of water
碳carbon                                56.1-62.4%
氮nitrogen                              17.5-19.4% 
细胞培养测试cell culture test           pass

ACS级
项目名称 Item                           ACS Grade
澄清度试验 Claroty of solution          Passes test
pH变色域  Visnal transition interva     6.8(red)-8.0(yellow)

品级Grade                               生物染色级 
                             (grade for the Biological Stain )
外观appearance                          dark green to black powder
红外光谱infrared spectrum               conforms to structure.
紫外可见光谱uv-visible spectrum         C = 0.005 G/L IN ACIDIFIED 50% ETHANOL
                                        E(541 +/- 3 NM) = 23,000 (MINIMUM)
                                        E(274 +/- 3 NM) = 26,000 (MINIMUM)
生物染色试验biological stain            passes staining tests
染料含量dye content                     ≥50.0%
水溶性solubility                        1 mg/ml H2O; red to dark red or dark purple solution