Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 3737-95-9, Whether you call it 2-Hydroxy-1-(2-hydroxy-4-sulfo-1-naphthylazo)-3-naphthoic Acid or Calcon-carboxylic Acid you can be assured the products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.