Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 633-96-5, Whether you call it D&C Orange No. 4, Acid Orange 7 , 4-(2-Hydroxy-1-naphthylazo)-benzenesulfonic Acid Sodium Salt , Orange II or Tropaeolin OOO No. 2 you can be assured the D&C Orange No. 4 products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.