S P E C I F I C A T I O N S

ERYTHROSIN B CERTIFIED

Synonyms:					C.I. 45430; Acid Red 51; Tetraiodofluorescein sodium salt

CAS No.:					16423-68-0

Chemical Formula:				C20H6I4Na2O5

Formula Weight:				879.87

Description:					Dark Red to maroon to brown powder

Dye content:					>80% 

Water insoluble matter:			< 0.20% 

Subsidiary dyes:				< 4.00%

Tri-Iodoresorcinol:				< 0.20%

Inorganic Iodides as Sodium Iodide:	< 0.10%

Solubility (10 mg/ml, H2O):		Clear, red-orange to red solution

Spectroscopy:				~525 nm

Visual Transition Interval:		From pH 0.0 (yellow)
						To      pH 3.5 (fluorescent red)

Effective Date: 02/19/10