[Studies on "Erythrosine Standard", Dye Standards of National Institute of Hygienic Sciences].

"Tartrazine Standard (C.I. 19140)", Dye Standards of National Institute of Hygienic Sciences, was prepared. The content of this Dye Standard was determined by the titanium trichloride method. This contents averaged 99.0%. Ultra violet-visible absorption and infrared spectra of the Dye Standard were also determined.