Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 116-63-2, Whether you call it 4-Amino-3-hydroxy-1-naphthalene Sulfonic Acid or 1-Amino-2-naphthol-4-sulfonic Acid you can be assured the products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.