Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 1811-28-5, Whether you call it Proflavine Sulfate, Hydrate, 3 -6-Diaminoacridine Sulfate - Dihydrate or 3 -6-Diaminoacridine Hemisulfate you can be assured the Proflavine Sulfate, Hydrate products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.